API Documentation

Everything you need to integrate your systems with our WhatsApp automation platform.

API Version 1.0

Base URL: guestmaker.ai

Quick Start

Get your first API call working in under 5 minutes with this step-by-step guide.

Get your API credentials

Request API access through our partner form or contact your account manager. You will receive:

An API key starting with gmkr_
Your hotel IDs from Settings → Hotels
Documentation on available scopes

Make your first API call

Create a reservation with guest information. This single call creates the reservation, links guests to a hotel, and triggers automation journeys.

curl -X POST https://guestmaker.ai/api/v1/reservations \
  -H "Authorization: Bearer gmkr_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "reservation_id": "RES-2026-001234",
    "confirmation_number": "CONF-ABC123",
    "hotel_name": "Grand Hotel",
    "check_in": "2026-03-15",
    "check_out": "2026-03-18",
    "status": "confirmed",
    "source": "pms",
    "amount": 450.00,
    "amount_net": 371.90,
    "currency": "EUR",
    "channel": "booking.com",
    "market_segment": "LEISURE",
    "agency_code": "AGY-001",
    "external_created_at": "2026-01-20T14:30:00+01:00",
    "external_updated_at": "2026-02-05T09:15:00+01:00",
    "guests": [
      {
        "first_name": "John",
        "last_name": "Doe",
        "email": "john@example.com",
        "phone": "+1234567890",
        "is_holder": true,
        "pax_type": "adult",
        "opt_in_status": "opted_in",
        "nationality": "US",
        "language": "en",
        "document_type": "passport",
        "document_number": "AB1234567"
      },
      {
        "first_name": "Jane",
        "last_name": "Doe",
        "pax_type": "adult"
      }
    ],
    "stays": [
      {
        "start_date": "2026-03-15",
        "end_date": "2026-03-18",
        "room_type": "Deluxe Suite",
        "room_number": "301",
        "board_type": "BB",
        "adults": 2
      }
    ]
  }'

Verify the response

A successful response includes the contact ID and event ID:

{
  "success": true,
  "data": {
    "reservation_id": "550e8400-e29b-41d4-a716-446655440002",
    "contact_id": "550e8400-e29b-41d4-a716-446655440000",
    "hotel_id": "550e8400-e29b-41d4-a716-446655440001",
    "is_new_contact": true,
    "event_id": "550e8400-e29b-41d4-a716-446655440003",
    "message": "Reservation created successfully"
  }
}

Set up webhooks (optional)

Configure webhook endpoints in your dashboard to receive real-time notifications when guests reply or journeys complete.

Explore the full API

Continue reading below to learn about events, webhooks, error handling, and best practices for production integrations.

Authentication

All API requests require authentication using a Bearer token in the Authorization header.

Authorization: Bearer gmkr_your_api_key

API Key Format

API keys are prefixed with gmkr_ for production keys or gmkr_test_ for sandbox keys. Your API key is provided when you set up your integration with us.

Available Scopes

Scope	Description
`guests:read`	Read guest/contact information
`guests:write`	Create/update guests with bookings
`events:write`	Send events to trigger journeys
`bookings:read`	Read reservation data
`bookings:write`	Create/update reservations
`webhooks:manage`	Configure outbound webhooks
`*`	Full access (all scopes)

Security Best Practices

Never expose your API key in client-side code
Store your API key in environment variables
Rotate your API key periodically
Use IP allowlists when possible
Request only the scopes you need

Keep your API key secure

Your API key grants access to your tenant's data. Treat it like a password and never share it publicly.

Reservations API

Create and update reservations from your PMS or booking engine. Supports multiple guests per reservation, room stays, and extras. Designed for enterprise PMS integrations with comprehensive data sync.

POST

/api/v1/reservations

Create or update a reservation with guests, stays, and extras. Uses upsert based on reservation_id.

Required Scope

reservations:write

Request Body

Parameter	Type	Required	Description
`reservation_id`	string	Required	Your PMS unique reservation ID (used for upsert matching)
`confirmation_number`	string	Optional	Booking confirmation/localizer code (can be shared across reservations)
`booking_id`	string	Optional	Parent booking ID (for grouping multiple reservations)
`hotel_id`	string	Optional	Hotel UUID (one of hotel_id, hotel_code, or hotel_name required)
`hotel_code`	string	Optional	Hotel code (alternative to hotel_id)
`hotel_name`	string	Optional	Hotel name (alternative to hotel_id)
`check_in`	string	Required	Check-in date (YYYY-MM-DD)
`check_out`	string	Required	Check-out date (YYYY-MM-DD)
`booking_date`	string	Optional	Date the booking was made (YYYY-MM-DD)
`status`	string	Optional	Reservation status: confirmed, pending (booking engine awaiting payment confirmation), modified, cancelled, no_show, checked_in, checked_out
`channel`	string	Optional	Booking channel (e.g., booking.com, expedia, direct)
`source`	string	Optional	System type that sent this data: pms, booking_engine, crm, channel_manager, website, etc. Defaults to "api"
`agency`	string	Optional	Travel agency name
`company`	string	Optional	Corporate booking company
`amount`	number	Optional	Total reservation amount (gross)
`amount_net`	number	Optional	Total reservation amount (net, before tax)
`currency`	string	Optional	ISO 4217 currency code (e.g., EUR, USD)
`market_segment`	string	Optional	PMS market segment code (e.g., "LEISURE", "CORPORATE")
`agency`	string	Optional	Selling agency / tour operator / OTA name (e.g. "BOOKING.COM", "EASYJET HOLIDAYS"). Max 200 chars
`agency_code`	string	Optional	Travel agency code from the PMS, where the source sends one. Max 100 chars
`nights`	number	Optional	Number of nights (accepted but not persisted — auto-computed from dates)
`external_created_at`	string	Optional	PMS creation timestamp (ISO 8601 with timezone)
`external_updated_at`	string	Optional	PMS last-updated timestamp (ISO 8601 with timezone)
`guests`	array	Required	Array of guests (1-20). See Guest Object below.
`stays`	array	Optional	Array of room stays (max 10). See Stay Object below.
`extras`	array	Optional	Array of extras/charges (max 100). See Extra Object below.
`comments`	string	Optional	Internal notes or special requests
`metadata`	object	Optional	Custom key-value data

Guest Object

Parameter	Type	Required	Description
`first_name`	string	Required	Guest first name
`last_name`	string	Optional	Guest last name
`email`	string	Optional	Guest email address. At least one of email or phone is required to create/match a contact.
`phone`	string	Optional	Phone number in E.164 format. At least one of email or phone is required to create/match a contact.
`is_holder`	boolean	Optional	Whether this is the primary guest/booker
`pax_type`	string	Optional	Passenger type: adult, child, infant
`date_of_birth`	string	Optional	Date of birth (YYYY-MM-DD)
`gender`	string	Optional	Guest gender: male, female, other, prefer_not_to_say
`nationality`	string	Optional	ISO 3166-1 alpha-2 country code
`document_type`	string	Optional	ID document type: passport, national_id, drivers_license, other
`document_number`	string	Optional	ID document number (max 50 characters)
`address`	object	Optional	Guest's postal address. All sub-fields optional: street (max 300), city (200), postal_code (40), province (200), state (200), country (ISO 3166-1 alpha-2 or alpha-3, normalized to alpha-2). Longer values are truncated and unrecognized ones dropped — a malformed address never rejects the reservation. A sub-field you omit is left untouched rather than cleared. In Spain, province is the two-digit INE code ("07" for the Balearics). Note country here is the country of RESIDENCE, which is not nationality.
`email_consent`	boolean	Optional	PMS-reported email marketing consent. Takes precedence over CDP auto-consent settings.
`whatsapp_marketing_consent`	boolean	Optional	PMS-reported WhatsApp/phone marketing consent. Takes precedence over CDP auto-consent settings.
`language`	string	Optional	Guest language code (e.g., "en", "es", "fr"). Defaults to "en" for new contacts.
`pre_checkin_completed_at`	string	Optional	ISO 8601 timestamp (with offset) when this guest completed online/pre-checkin in the PMS or booking-engine portal. Omit or send null if the guest hasn't pre-checked-in yet.
`pre_checkin_source`	string	Optional	Where the pre-checkin was completed (e.g., "mews", "cloudbeds", "apaleo", "self_service"). Max 50 chars.

Stay Object

Parameter	Type	Required	Description
`start_date`	string	Required	Stay start date (YYYY-MM-DD)
`end_date`	string	Required	Stay end date (YYYY-MM-DD)
`room_type`	string	Optional	Room type/category
`room_number`	string	Optional	Assigned room number
`board_type`	string	Optional	Meal plan: RO (Room Only), BB (Bed & Breakfast), HB (Half Board), FB (Full Board), AI (All Inclusive)
`rate_code`	string	Optional	Rate code/plan
`adults`	number	Optional	Number of adults
`children`	number	Optional	Number of children
`babies`	number	Optional	Number of infants

Extra Object

Parameter	Type	Required	Description
`name`	string	Required	Charge description
`amount`	number	Required	Charge amount
`code`	string	Optional	Charge code from PMS
`quantity`	number	Optional	Quantity (default: 1)
`date`	string	Optional	Charge date (YYYY-MM-DD)
`notes`	string	Optional	Additional notes

Example Request

curl -X POST https://guestmaker.ai/api/v1/reservations \
  -H "Authorization: Bearer gmkr_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "reservation_id": "RES-2026-001234",
    "confirmation_number": "CONF-ABC123",
    "hotel_name": "Grand Hotel",
    "check_in": "2026-03-15",
    "check_out": "2026-03-18",
    "status": "confirmed",
    "source": "pms",
    "amount": 450.00,
    "amount_net": 371.90,
    "currency": "EUR",
    "channel": "booking.com",
    "market_segment": "LEISURE",
    "agency_code": "AGY-001",
    "external_created_at": "2026-01-20T14:30:00+01:00",
    "external_updated_at": "2026-02-05T09:15:00+01:00",
    "guests": [
      {
        "first_name": "John",
        "last_name": "Doe",
        "email": "john@example.com",
        "phone": "+1234567890",
        "is_holder": true,
        "pax_type": "adult",
        "opt_in_status": "opted_in",
        "nationality": "US",
        "language": "en",
        "document_type": "passport",
        "document_number": "AB1234567"
      },
      {
        "first_name": "Jane",
        "last_name": "Doe",
        "pax_type": "adult"
      }
    ],
    "stays": [
      {
        "start_date": "2026-03-15",
        "end_date": "2026-03-18",
        "room_type": "Deluxe Suite",
        "room_number": "301",
        "board_type": "BB",
        "adults": 2
      }
    ]
  }'

Response

{
  "success": true,
  "data": {
    "reservation_id": "550e8400-e29b-41d4-a716-446655440000",
    "external_reservation_id": "RES-2026-001234",
    "is_new": true,
    "hotel_id": "550e8400-e29b-41d4-a716-446655440001",
    "contacts": [
      {
        "contact_id": "550e8400-e29b-41d4-a716-446655440002",
        "phone": "+1234567890",
        "email": "john@example.com",
        "is_new": true,
        "is_holder": true
      },
      {
        "contact_id": null,
        "phone": null,
        "email": null,
        "is_new": false,
        "is_holder": false
      }
    ],
    "warnings": []
  }
}

Contact Creation

Guests with a valid phone number are created as contacts in Guestmaker. Guests without phone numbers are stored in the reservation but cannot receive WhatsApp messages. The response indicates which guests were created as contacts via contact_id.

Upsert Behavior

The reservation_id field is your PMS's unique identifier. Sending the same reservation_id again will update the existing reservation rather than creating a duplicate. This enables seamless sync from your PMS without tracking which reservations already exist.

POST

/api/v1/reservations/batch

Create or update up to 50 reservations in a single request. Uses a partial success model — each reservation is processed independently.

Reservation Status Values

Status values and their meaning

Status	Description	Guest Stage
`confirmed`	Reservation confirmed	Pre-arrival
`pending`	Booking engine awaiting payment confirmation	Pre-arrival
`modified`	Reservation modified after confirmation	Pre-arrival
`checked_in`	Guest has arrived	In-house
`checked_out`	Guest has departed	Post-stay
`cancelled`	Reservation cancelled	—
`no_show`	Guest did not arrive	—

Guests API

Create and manage guest contacts with their booking information. Guests are automatically linked to hotels for AI-powered conversations and journey automation.

POST

/api/v1/guests

Create a new guest or update an existing one with booking information

Request Body

Parameter	Type	Required	Description
`phone`	string	Required	Phone number in E.164 format (e.g., +1234567890)
`first_name`	string	Required	Guest's first name
`last_name`	string	Required	Guest's last name
`email`	string	Optional	Guest's email address
`language`	string	Optional	Preferred language code (e.g., en, es, fr). Default: en
`tags`	string[]	Optional	Array of tags for segmentation
`custom_fields`	object	Optional	Key-value pairs matching your registered custom field definitions. See Custom Fields API for setup.
`hotel_name`	string	Optional	Hotel name to link the guest to
`hotel_code`	string	Optional	Hotel code (alternative to hotel_name)
`source`	string	Optional	System type that sent this data: pms, booking_engine, crm, channel_manager, website, etc. Defaults to "api"
`booking`	object	Optional	Booking/reservation details (see below)
`trigger_event`	boolean	Optional	Trigger booking.created event (default: true)
`update_if_exists`	boolean	Optional	Update existing contact by phone (default: true)
`opt_in_status`	string	Optional	Legacy field (deprecated). Use whatsapp_marketing_consent instead.
`whatsapp_marketing_consent`	boolean	Optional	WhatsApp marketing consent (default: false). When true, guest receives marketing WhatsApp messages.
`email_consent`	boolean	Optional	Email marketing consent (default: false). When true, guest receives marketing emails.
`date_of_birth`	string	Optional	Guest date of birth (YYYY-MM-DD)
`gender`	string	Optional	Guest gender: male, female, other, prefer_not_to_say
`nationality`	string	Optional	ISO 3166-1 alpha-2 country code (e.g., US, ES, GB)
`document_type`	string	Optional	ID document type: passport, national_id, drivers_license, other
`document_number`	string	Optional	ID document number (max 50 characters)
`address`	object	Optional	Guest's postal address. All sub-fields optional: street (max 300), city (200), postal_code (40), province (200), state (200), country (ISO 3166-1 alpha-2 or alpha-3, normalized to alpha-2). Longer values are truncated and unrecognized ones dropped — a malformed address never rejects the request. A sub-field you omit is left untouched rather than cleared. In Spain, province is the two-digit INE code ("07" for the Balearics). Note country here is the country of RESIDENCE, which is not nationality.
`subscription_status`	string	Optional	Communication subscription status: active, unsubscribed
`communication_preferences`	object	Optional	Granular communication preferences (see below)
`consent_source`	string	Optional	Your identifier for where consent was collected
`consent_timestamp`	string	Optional	ISO 8601 timestamp when consent was given

Booking Object

Parameter	Type	Required	Description
`booking_id`	string	Required	Parent booking ID (groups multiple reservations, e.g., Expedia booking with 4 rooms)
`reservation_id`	string	Optional	Individual reservation/localizer code (defaults to booking_id if not provided)
`check_in`	string	Required	Check-in date (YYYY-MM-DD)
`check_out`	string	Required	Check-out date (YYYY-MM-DD)
`room_type`	string	Optional	Room type/category
`room_number`	string	Optional	Assigned room number (if known)
`rate_plan`	string	Optional	Rate plan name
`board_type`	string	Optional	Meal plan: RO (Room Only), BB (Bed & Breakfast), HB (Half Board), FB (Full Board), AI (All Inclusive)
`booking_channel`	string	Optional	Raw PMS channel code (e.g. BDC, EXP). Stored as booking_channel_code. Auto-resolved to human-readable name and channel type (direct/ota/tour_operator) if tenant has mappings configured.
`total_amount`	number	Optional	Total booking amount
`currency`	string	Optional	Currency code (default: EUR)
`status`	string	Optional	Confirmed, Modified, CheckedIn, CheckedOut, Cancelled, NoShow
`guests`	array	Optional	Additional guests on the booking (see Booking Guests below)
`extras`	array	Optional	Booking extras like spa, minibar, restaurant (see Booking Extras below)

Booking Guests Array

Parameter	Type	Required	Description
`first_name`	string	Required	Guest's first name
`last_name`	string	Optional	Guest's last name
`email`	string	Optional	Guest's email address
`is_holder`	boolean	Optional	Whether this guest is the reservation holder (default: false)
`pax_type`	string	Optional	Adult, Child, or Infant
`relationship_to_holder`	string	Optional	Spouse, Child, Colleague, Friend, etc.
`pre_checkin_completed_at`	string	Optional	ISO 8601 timestamp (with offset) when this companion guest completed online/pre-checkin.
`pre_checkin_source`	string	Optional	Where the pre-checkin was completed (e.g., "mews", "cloudbeds", "self_service"). Max 50 chars.

Booking Extras Array

Parameter	Type	Required	Description
`name`	string	Required	Extra name (e.g., Spa Services, Minibar, Restaurant)
`amount`	number	Required	Amount charged
`quantity`	number	Optional	Quantity (default: 1)
`notes`	string	Optional	Additional notes or description

Communication Preferences Object (legacy)

Legacy communication preferences. Prefer using whatsapp_marketing_consent and email_consent boolean fields directly on the guest object.

Parameter	Type	Required	Description
`marketing`	boolean	Optional	Consent to receive marketing messages (promotions, offers). Default: false. Maps to whatsapp_marketing_consent.
`utility`	boolean	Optional	Utility messages (booking confirmations, reminders) are always delivered. This field is ignored.

Note: When a guest unsubscribes via WhatsApp chat, they can choose to stop all communications or only marketing messages while keeping utility messages active.

Example Request

curl -X POST https://guestmaker.ai/api/v1/guests \
  -H "Authorization: Bearer gmkr_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "phone": "+1234567890",
    "first_name": "John",
    "last_name": "Doe",
    "email": "john@example.com",
    "nationality": "US",
    "document_type": "passport",
    "document_number": "AB1234567",
    "source": "pms",
    "hotel_name": "Grand Hotel",
    "booking": {
      "booking_id": "BK-12345",
      "check_in": "2026-03-15",
      "check_out": "2026-03-18",
      "room_type": "Deluxe Suite",
      "total_amount": 450.00,
      "status": "Confirmed"
    }
  }'

Response

{
  "success": true,
  "data": {
    "contact_id": "550e8400-e29b-41d4-a716-446655440000",
    "is_new": true,
    "hotel_id": "550e8400-e29b-41d4-a716-446655440001",
    "reservation_id": "550e8400-e29b-41d4-a716-446655440002",
    "event_id": "550e8400-e29b-41d4-a716-446655440003",
    "message": "Guest created successfully"
  }
}

POST

/api/v1/guests/batch

Create or update up to 500 guests in a single request. Uses a partial success model — each guest is processed independently.

GET

/api/v1/guests

Retrieve a guest by phone number with their reservations

Events API

Send events to trigger journey automations. Events are matched against active journey triggers to start automated WhatsApp conversations.

POST

/api/v1/events

Create an event to trigger matching journey automations

Request Body

Parameter	Type	Required	Description
`event_type`	string	Required	Event type identifier (e.g., guest.checked_in)
`payload`	object	Required	Event data available in journey context
`contact_id`	string	Optional	Contact UUID (if known)
`guest_phone`	string	Optional	Phone number to identify the contact (E.164)
`hotel_id`	string	Optional	Hotel UUID (if known)
`hotel_name`	string	Optional	Hotel name to resolve hotel_id
`hotel_code`	string	Optional	Hotel code to resolve hotel_id
`idempotency_key`	string	Optional	Unique key to prevent duplicate events
`source`	string	Optional	Source system identifier for tracking

Standard Event Types

These standard event types are recognized by the system. You can also create custom event types.

booking.created

New booking received

booking.updated

Booking modified

booking.cancelled

Booking cancelled

guest.checked_in

Guest arrived

guest.checked_out

Guest departed

guest.message

Guest sent message

payment.received

Payment confirmed

review.requested

Review requested

Custom event types should follow the pattern category.action (e.g., spa.appointment_booked)

Example Request

curl -X POST https://guestmaker.ai/api/v1/events \
  -H "Authorization: Bearer gmkr_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "event_type": "guest.checked_in",
    "guest_phone": "+1234567890",
    "hotel_name": "Grand Hotel",
    "payload": {
      "room_number": "301",
      "checked_in_at": "2026-03-15T14:30:00Z"
    },
    "idempotency_key": "checkin-BK-12345"
  }'

Response

{
  "success": true,
  "data": {
    "event_id": "550e8400-e29b-41d4-a716-446655440000",
    "status": "accepted",
    "contact_id": "550e8400-e29b-41d4-a716-446655440001",
    "hotel_id": "550e8400-e29b-41d4-a716-446655440002",
    "matching_journeys": 2,
    "created_at": "2026-03-15T14:30:00Z",
    "message": "Event accepted and queued for processing"
  }
}

Idempotency

Always include an idempotency_key to prevent duplicate events. If you send the same idempotency key twice, the second request returns the original event.

GET

/api/v1/events

List available event types for your tenant

Custom Fields API

Define custom data fields for your integration to extend guest profiles with partner-specific data. Custom fields appear in the segment builder, enabling hotel teams to create targeted segments based on your data.

POST

/api/v1/fields

Create or update custom field definitions. Uses upsert based on field_key — sending an existing key updates it.

Required Scope

custom_fields:write

Request Body

Parameter	Type	Required	Description
`fields`	array	Required	Array of field definitions (max 50)
`fields[].field_key`	string	Required	Unique key (lowercase, a-z, 0-9, underscores, must start with letter)
`fields[].field_label`	string	Required	Display label shown to hotel staff
`fields[].field_type`	string	Required	One of: string, text, number, boolean, date, datetime, select, multiselect
`fields[].options`	string[]	Optional	Required for select/multiselect types
`fields[].description`	string	Optional	Help text for hotel staff
`fields[].is_required`	boolean	Optional	Whether field must have a value (default: false)
`fields[].is_visible`	boolean	Optional	Show in contact details UI (default: true)
`fields[].display_order`	number	Optional	Sort order within your fields (default: 0)

Example Request

curl -X POST https://guestmaker.ai/api/v1/fields \
  -H "Authorization: Bearer gmkr_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "fields": [
      {
        "field_key": "loyalty_tier",
        "field_label": "Loyalty Tier",
        "field_type": "select",
        "options": ["Bronze", "Silver", "Gold", "Platinum"],
        "description": "Guest loyalty program tier"
      },
      {
        "field_key": "loyalty_points",
        "field_label": "Loyalty Points",
        "field_type": "number",
        "description": "Current loyalty point balance"
      },
      {
        "field_key": "member_since",
        "field_label": "Member Since",
        "field_type": "date"
      }
    ]
  }'

Response

{
  "success": true,
  "data": {
    "fields": [
      { "field_key": "loyalty_tier", "field_label": "Loyalty Tier", "field_type": "select", "created_at": "2026-01-31T10:00:00Z", "updated_at": "2026-01-31T10:00:00Z" },
      { "field_key": "loyalty_points", "field_label": "Loyalty Points", "field_type": "number", "created_at": "2026-01-31T10:00:00Z", "updated_at": "2026-01-31T10:00:00Z" },
      { "field_key": "member_since", "field_label": "Member Since", "field_type": "date", "created_at": "2026-01-31T10:00:00Z", "updated_at": "2026-01-31T10:00:00Z" }
    ],
    "message": "3 field definition(s) created/updated successfully"
  }
}

GET

/api/v1/fields

List all custom field definitions registered by your integration

Integration with Segments

Custom fields set via the Guests API (custom_fields object) are automatically stored against the matching field definitions. Hotel staff can use these fields in the segment builder under the 'Custom Fields' category to create targeted audience segments.

Field Types Reference

Supported field types and their expected values

Type	Description	Example Value
`string`	Short text (single line)	`"John Doe"`
`text`	Long text (multi-line)	`"Special dietary requirements..."`
`number`	Numeric value	`1500`
`boolean`	True/false	`true`
`date`	Date (YYYY-MM-DD)	`"2026-03-15"`
`datetime`	Date and time (ISO 8601)	`"2026-03-15T14:30:00Z"`
`select`	Single choice from options	`"Gold"`
`multiselect`	Multiple choices from options	`["spa", "golf"]`

CDP API

The Customer Data Platform API enables anonymous visitor tracking, identity resolution, and post-checkout reservation ingestion. Track website visitors, link them to known identities, and ingest reservation data for profile consolidation across your hotel group.

GuestMaker.js SDK

For website tracking, use the GuestMaker.js SDK which handles visitor ID management, event batching, and automatic page view tracking. See the SDKs page for setup instructions.

Domain Restrictions

When domain restrictions are configured in CDP Settings, the events endpoint validates the Origin header against the allowed domains list. Requests from non-allowed origins will be rejected with a 403 error.

POST

/api/v1/cdp/events

Submit batched visitor tracking events from your website's tracking snippet. Returns 202 Accepted -- events are processed asynchronously.

Required Scope

cdp:write

Requires visitor tracking to be enabled in CDP Settings.

Request Body

Parameter	Type	Required	Description
`visitor_id`	string	Required	Anonymous visitor identifier (from SDK cookie)
`session_id`	string	Required	Session identifier (from SDK sessionStorage)
`device`	object	Optional	{ type: "desktop"\|"mobile"\|"tablet", browser, os, language }
`utm`	object	Optional	{ source, medium, campaign, term, content }
`referrer`	string	Optional	HTTP referrer URL
`events`	array	Required	Array of event objects (1-100). See Event Object below.

Event Object

Parameter	Type	Required	Description
`type`	string	Required	Event type: page_view, scroll, click, form_start, form_submit, identify, custom
`url`	string	Optional	Page URL (domain stripped server-side for privacy)
`title`	string	Optional	Page title
`data`	object	Optional	Custom event data (e.g., scroll depth, click element)
`ts`	string	Required	ISO 8601 timestamp

Example Request

curl -X POST https://guestmaker.ai/api/v1/cdp/events \
  -H "Authorization: Bearer gmkr_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "visitor_id": "vis_abc123def456",
    "session_id": "sess_789xyz",
    "device": {
      "type": "desktop",
      "browser": "Chrome 120",
      "os": "Windows 11",
      "language": "en-US"
    },
    "utm": {
      "source": "google",
      "medium": "cpc",
      "campaign": "summer-2026"
    },
    "referrer": "https://www.google.com/search?q=luxury+hotels",
    "events": [
      {
        "type": "page_view",
        "url": "/rooms/deluxe-suite",
        "title": "Deluxe Suite | Grand Hotel",
        "ts": "2026-02-19T14:30:00.000Z"
      },
      {
        "type": "scroll",
        "url": "/rooms/deluxe-suite",
        "data": { "depth": 75 },
        "ts": "2026-02-19T14:30:45.000Z"
      },
      {
        "type": "click",
        "url": "/rooms/deluxe-suite",
        "data": { "element": "book-now-btn", "text": "Book Now" },
        "ts": "2026-02-19T14:31:02.000Z"
      }
    ]
  }'

Response (202 Accepted)

{
  "success": true,
  "data": {
    "accepted": 3
  }
}

POST

/api/v1/cdp/identify

Link an anonymous visitor to a known identity (email, phone, name). Creates or links a CDP profile and enriches the visitor record.

POST

/api/v1/cdp/reservations

Ingest a single post-checkout reservation with guests and extras for identity resolution. Uses the CDP-specific ingestion pipeline (separate from the main Reservations API).

POST

/api/v1/cdp/reservations/batch

Synchronous batch of up to 100 reservations. Each reservation is processed independently with partial success semantics.

POST

/api/v1/cdp/reservations/bulk

Async bulk ingestion of up to 5,000 reservations. Returns 202 Accepted with a batch_id for status polling.

GET

/api/v1/cdp/batches/{id}

Check the status of a bulk ingestion batch. Poll this endpoint after submitting a bulk ingestion request.

Loyalty API

The loyalty program offers two integration models — choose by who is acting. Your backend can act for the hotel over the REST API, or a guest can sign themselves in with Loyalty SSO. Most booking-engine integrations use both.

Server-to-server

Server REST API

Your backend acts for the hotel with an API key. Look up any guest by email; enroll, award, redeem, sync points and cash credit.

Auth · Authorization: Bearer <api_key>

Endpoints below

Guest sign-in · OIDC

Loyalty SSO (OIDC)

The guest signs in with their loyalty account (OAuth2 + PKCE). Read only that guest’s tier, balance and history to personalise the booking flow.

Auth · per-guest tokens (id_token + Bearer access token)

Integration guide

Not sure which? Use the REST API when your server acts on the hotel’s behalf (PMS sync, awarding, redemption, cash credit). Use Loyalty SSO when a guest logs in on your site and you personalise for them. Balance & history exist in both worlds by design — same data, different trust boundary.

GET

/api/v1/loyalty/check

Quick check whether an email address is enrolled in the loyalty program

Query Parameters

Parameter	Type	Required	Description
`email`	string	Required	Guest email address

Response (Member Found)

{
  "success": true,
  "data": {
    "is_member": true,
    "member_summary": {
      "member_id": "uuid",
      "tier_name": "Gold",
      "tier_slug": "gold",
      "points_balance": 1500,
      "lifetime_points": 3000,
      "joined_at": "2025-01-15T10:30:00Z"
    }
  }
}

Response (Not a Member)

{
  "success": true,
  "data": {
    "is_member": false,
    "member_summary": null
  }
}

POST

/api/v1/loyalty/enroll

Enroll a new member in the loyalty program (creates contact if needed)

POST

/api/v1/loyalty/unsubscribe

Deactivate a member (leave the program). The inverse of enroll — keeps points, blocks SSO sign-in, and is reversible by re-enrolling.

GET

/api/v1/loyalty/member

Retrieve full loyalty member details including tier, points, and available rewards

POST

/api/v1/loyalty/points

Award points to a loyalty member (e.g., for bookings, referrals, promotions)

POST

/api/v1/loyalty/redeem

Redeem a reward for a loyalty member. Designed for PMS / POS / booking-engine auto-ingest at scale (idempotent + auto-fulfilled supported).

POST

/api/v1/loyalty/redemptions/batch

Submit up to 100 redemptions in a single call. Each item is independently processed + independently idempotent. Built for nightly reconciliation jobs across a hotel group.

GET

/api/v1/loyalty/rewards

List all available rewards with optional category filtering and pagination

GET

/api/v1/loyalty/tiers

Retrieve all loyalty program tiers with benefits and qualification thresholds

GET

/api/v1/loyalty/transactions

Retrieve points transaction history for a loyalty member

GET

/api/v1/loyalty/calculate

Calculate how many points would be earned for a given spend amount

More REST endpoints — same Bearer auth and response envelope, grouped for completeness.

Earning & adjustments guests:write

POST /api/v1/loyalty/actions — award a non-stay action bonus (review, survey, app download)
POST /api/v1/loyalty/points/confirm — confirm a pending earn into the live balance
POST /api/v1/loyalty/points/void — void a pending earn before confirmation
POST /api/v1/loyalty/reverse — reverse earned points on cancellation / no-show
POST /api/v1/loyalty/apply-discount — spend points as a currency discount on a booking/POS
POST /api/v1/loyalty/redeem-free-night — redeem points for a free-night voucher code

Advanced

GET /api/v1/loyalty/conversion — points ↔ currency calculator guests:read
GET /api/v1/loyalty/households · POST — household pool balance & pooled redemption
GET /api/v1/loyalty/liability — points-liability & program-health report guests:read
POST /api/v1/loyalty/experiences/bid — bid points on an auction experience

Authentication & Scopes

Authenticate every REST call with Authorization: Bearer <api_key> — your tenant is derived from the key (no separate slug header). Read endpoints (check, member, rewards, tiers, transactions, calculate) require the guests:read scope; write endpoints (enroll, points, redeem, cash credit) require guests:write. All endpoints are rate limited to 10 requests/minute per IP.

JavaScript SDK Available

A client-side JavaScript SDK wraps the core loyalty endpoints with automatic header injection and error handling.

Cash Credit

New

Let members spend their points as money credit on direct bookings, in-stay folio charges, and at checkout. Atomic Quote → Hold → Confirm/Release/Expire lifecycle — see the deep-dive pages for the full integration walkthrough.

Overview

Lifecycle diagram, surfaces, error codes, and the OTA denylist.

Booking engine

5-minute drop-in <script> embed with apply callback.

PMS

/reservation-snapshot + 5 HMAC webhooks for real-time balance sync.

Endpoints (scope guests:write)

GET /api/v1/loyalty/credit/quote — read spendable + presets
POST /api/v1/loyalty/credit/hold — reserve points (atomic, idempotent on external_reference_id)
POST /api/v1/loyalty/credit/confirm — commit deduction
POST /api/v1/loyalty/credit/release — release an active hold
POST /api/v1/loyalty/credit/reverse — claw back after cancellation
GET /api/v1/loyalty/reservation-snapshot — PMS folio render in one call

Loyalty SSO (OIDC)

GuestMaker is a standard OpenID Connect Identity Provider for loyalty guests. Your website signs guests in with their loyalty account via Authorization Code + PKCE, then reads tier, points balance and history to personalise the booking flow.

Integration guide

The flow, scopes & claims, mandatory security requirements, token model, and endpoints.

Booking engine quickstart

A copy-paste, framework-neutral walkthrough — authorize URL, PKCE, token exchange, id_token verification, and reading member data.

Endpoints (Authorization Code + PKCE)

GET /api/oidc/.well-known/openid-configuration — discovery (load endpoints + JWKS from here)
GET /api/oidc/auth — authorize (browser redirect, PKCE S256)
POST /api/oidc/token — token exchange (client_secret_basic)
GET /api/oidc/jwks — RS256 public signing keys
GET /api/loyalty/me/balance — member tier + points (Bearer)
GET /api/loyalty/me/transactions — points history (Bearer)

Newsletter Signup

Embed a newsletter signup form on your own website. Confirmed subscribers become contacts with marketing consent granted, so your recurring newsletter campaigns reach them automatically. Configure and activate the widget first in Settings → Email → Newsletter Signup, then copy your publishable key from the Install tab. These routes accept two auth modes: a gm_pub_… publishable key for browser embeds (safe to ship in page HTML; the request Origin must match your configured domain allow-list), or a secret gmkr_… API key for server-to-server calls (e.g. a booking engine) — secret-key requests are trusted by the key alone and skip the Origin check. See Authentication below.

Quick install (zero-code drop-in)

<div data-gm-newsletter
     data-token="gm_pub_your_publishable_key"
     data-fields="email"></div>
<script src="https://www.guestmaker.ai/sdk/guestmaker.js" async></script>

Or build your own UI and call the SDK headlessly:

GuestMaker.newsletter.subscribe({
  email: 'guest@example.com',
  token: 'gm_pub_your_publishable_key'
}).then(function (r) {
  // r.status === 'pending' | 'subscribed'
})

Always use the host https://www.guestmaker.ai — the apex domain redirects and drops the auth header.

POST

/api/v1/newsletter/subscribe

Subscribe an email address. Double opt-in sends a confirmation email; single opt-in subscribes immediately.

Authentication

Frontend (browser widget) — publishable key as a Bearer token (Authorization: Bearer gm_pub_…). The request Origin/Referer host must be on your domain allow-list, or the request is rejected with 403. This is the path the drop-in widget and SDK use.

Backend (server-to-server) — a secret key as a Bearer token (Authorization: Bearer gmkr_…) with the guests:write scope. Use this when subscribing from your own server (no browser Origin) — the secret key is the trust anchor, so the Origin allow-list and Turnstile are skipped. Never expose a gmkr_… key in client-side code.

Either way, the newsletter widget must first be activated in Settings → Email → Newsletter Signup; a 403 with Newsletter signup not enabled means no active config exists yet.

Backend example (server-to-server)

curl -X POST https://www.guestmaker.ai/api/v1/newsletter/subscribe \
  -H "Authorization: Bearer gmkr_your_secret_key" \
  -H "Content-Type: application/json" \
  -d '{
    "email": "guest@example.com",
    "consent": true,
    "source": "booking_engine"
  }'

Request Body

Parameter	Type	Required	Description
`email`	string	Required	Subscriber email (max 254)
`consent`	true	Required	Explicit consent; rejected if absent or false
`first_name`	string	Optional	Only stored if the first_name field is enabled in your config
`language`	string	Optional	ISO 639-1 (max 10), normalised to lowercase
`hotel_id`	UUID	Optional	Property of interest; validated against your active hotels
`source`	string	Optional	Free-form provenance label (max 200)
`turnstile_token`	string	Optional	Cloudflare Turnstile token, when Turnstile is enabled
`_hp`	string	Optional	Honeypot — must be empty; a non-empty value is silently treated as a bot

Response (200)

{ "status": "pending" }

pending = double opt-in confirmation email sent; subscribed = single opt-in, marketable immediately. The response is identical for new / pending / already-confirmed addresses (no membership enumeration).

GET

/api/public/newsletter/confirm

Two-step double opt-in confirmation (browser-facing, not a JSON API)

GET

/api/v1/newsletter/config

Presentation-only config the drop-in widget uses to self-render

Webhooks

Receive real-time notifications when events occur in the platform. Configure webhook endpoints in your dashboard settings.

Available Webhook Events

Events that can be delivered to your webhook endpoints

message.receivedIncoming message

message.sentOutgoing message sent

message.deliveredMessage delivered

message.readMessage read by recipient

contact.createdNew contact added

contact.updatedContact info changed

contact.deletedContact deleted

conversation.createdNew conversation started

conversation.closedConversation closed

journey.startedJourney automation began

journey.completedJourney automation finished

journey.failedJourney execution error

broadcast.sentBroadcast campaign sent

broadcast.completedBroadcast finished

reservation.checked_inGuest checked in (daily date-scan — see note)

reservation.checked_outGuest checked out (daily date-scan — see note)

Note — reservation.checked_in / checked_out timing. These fire from a daily date-scan when the guest's check-in or check-out date is reached — not in real time. Each delivery includes a scheduled_for object with the guest's expected local check-in/out time, so you can schedule downstream actions on your side. The expected times are configurable per account (defaults: check-in 15:00, check-out 12:00, hotel timezone).

Webhook Payload Format

All webhooks follow this consistent format

{
  "event_type": "contact.created",
  "timestamp": "2026-03-15T10:30:00Z",
  "data": {
    "contact": {
      "id": "550e8400-e29b-41d4-a716-446655440000",
      "phone": "+1234567890",
      "first_name": "John",
      "last_name": "Doe",
      "email": "john@example.com",
      "hotel_id": "550e8400-e29b-41d4-a716-446655440001"
    }
  }
}

Reservation events carry the booking, the guest, and the scheduled_for hint:

{
  "event_type": "reservation.checked_in",
  "timestamp": "2026-07-10T03:12:08Z",
  "data": {
    "reservation": {
      "id": "…", "hotel_id": "…", "status": "CheckedIn",
      "check_in": "2026-07-10", "check_out": "2026-07-12",
      "localizer_code": "ABC123", "booking_id": "…",
      "source": "…", "booking_channel": "…", "total_value": 540, "currency": "EUR"
    },
    "contact": {
      "id": "…", "first_name": "John", "last_name": "Doe",
      "email": "john@example.com", "phone": "+34600000000",
      "language": "en", "nationality": "GB"
    },
    "scheduled_for": {
      "date": "2026-07-10", "local_time": "15:00",
      "timezone": "Europe/Madrid", "iso": "2026-07-10T13:00:00.000Z"
    }
  }
}

Security Headers

Headers included with every webhook request

Parameter	Type	Required	Description
`X-Webhook-Signature`	string	Required	HMAC-SHA256 signature: sha256=...
`X-Webhook-Event`	string	Required	The event type being delivered
`X-Webhook-Delivery`	string	Required	Unique delivery ID (UUID)
`X-Webhook-Timestamp`	string	Required	ISO 8601 timestamp of the event

Verifying Signatures

Always verify webhook signatures to ensure requests are authentic

const crypto = require('crypto');

// Sign over `timestamp + "." + rawBody` (the timestamp is signed for replay
// resistance). Verify against the RAW request body, never a re-serialized object.
function verifyWebhookSignature(rawBody, timestamp, signature, secret) {
  const expected = crypto
    .createHmac('sha256', secret)
    .update(`${timestamp}.${rawBody}`)
    .digest('hex');

  return `sha256=${expected}` === signature;
}

// Capture the raw body (do NOT re-serialize req.body):
app.use('/webhook', express.raw({ type: 'application/json' }));
app.post('/webhook', (req, res) => {
  const rawBody = req.body.toString('utf8');
  const timestamp = req.headers['x-webhook-timestamp'];
  const signature = req.headers['x-webhook-signature'];

  if (!verifyWebhookSignature(rawBody, timestamp, signature, 'your_webhook_secret')) {
    return res.status(401).send('Invalid signature');
  }
  // Replay protection: reject stale timestamps (±5 min); dedup on X-Webhook-Delivery.
  if (Math.abs(Date.now() - new Date(timestamp).getTime()) > 5 * 60 * 1000) {
    return res.status(401).send('Stale timestamp');
  }

  const { event_type, data } = JSON.parse(rawBody);
  console.log(`Received event: ${event_type}`, data);

  res.status(200).send('OK');
});

CTI / Telephony

Connect your call center to GuestMaker for inbound screen pop, click-to-call, call recording, and a per-contact call history. All providers expose the same unified contract — connect once, and your agents get the same experience whether the underlying system is Ringover, Microsoft Teams, or another supported provider.

Setup

Connecting a CTI provider to GuestMaker

Step 1. In the dashboard, open Settings → Integrations → {Provider} and click Connect.

Step 2. Paste your provider credentials (API key for Ringover, OAuth consent flow for Teams). GuestMaker validates the credentials and returns a per-tenant Webhook URL and Authorization token.

Step 3. In your provider's dashboard, configure a webhook with that URL and token. Enable these events: call_ringing, call_answered, call_hangup, call_missed, record_available.

Step 4. Click Test connection — a simulated incoming call fires the screen pop in your dashboard.

Step 5. Configure screen-pop modes (auto-navigate, notification banner, new-tab) and the widget position. Agents are auto-mapped from your provider's user list by email.

Webhook Events

Call lifecycle events GuestMaker accepts from every CTI provider

call_ringingCall ringing — triggers contact lookup + screen pop

call_answeredCall picked up by an agent

call_hangupCall ended (carries duration in seconds)

call_missedCall not answered

record_availableRecording URL ready

call_completedOne post-call record (metadata + optional transcript/summary) — see Completed-Call Push below

Webhook Authentication

Bearer-token auth in the Authorization header, timing-safe-compared per request

POST /api/webhooks/cti
Authorization: Bearer <your_webhook_token>
Content-Type: application/json

{
  "event_type": "call_ringing",
  "call_id": "ringover-abc-123",
  "user_id": "ringover-user-42",
  "from_number": "+34612345678",
  "to_number": "+34900111222",
  "direction": "inbound"
}

Your token maps to one integration, which identifies both the account and the provider — so this single URL works for every provider, no vendor slug needed. The scoped form /api/webhooks/cti/{provider} is equivalent and still supported.

Field names are accepted in either snake_case or camelCase, and may also appear nested under a data object. Per-tenant rate limit: 100 requests/minute.

Completed-Call Push (call_completed)

Send one record per finished call — for providers that push call details after hang-up, instead of (or alongside) the live lifecycle events

POST one call_completed event per finished call. Re-send the same call_id later to update the record in place — the intended way to attach a transcript once transcription finishes. When a transcript is present, it is mined into the guest's AI memory.

POST /api/webhooks/cti
Authorization: Bearer <your_webhook_token>
Content-Type: application/json

{
  "event": "call_completed",
  "call_id": "zn-8f3a2c91",
  "direction": "inbound",
  "from": "+34600111222",
  "to": "+34971000000",
  "agent": { "id": "zoon-user-42", "email": "agent@hotel.com" },
  "caller": { "name": "María García", "email": "maria@example.com" },
  "started_at": "2026-07-16T10:31:04Z",
  "answered_at": "2026-07-16T10:31:12Z",
  "ended_at": "2026-07-16T10:35:49Z",
  "outcome": "completed",
  "recording_url": "https://rec.example.com/zn-8f3a2c91.mp3",
  "summary": "Guest asked about a late checkout on the 18th.",
  "transcript": [
    { "speaker": "guest", "text": "Hola, quería un late checkout.", "offset_ms": 0 },
    { "speaker": "agent", "text": "Claro, dígame su habitación.", "offset_ms": 4200 }
  ]
}

Request Body

Parameter	Type	Required	Description
`event`	string	Required	The literal "call_completed".
`call_id`	string	Required	Your stable unique id — the sole idempotency key, scoped per (tenant, provider).
`direction`	string	Required	inbound or outbound. Omit it entirely to send a content patch (see below).
`from / to`	string	Required	E.164 numbers. The guest side (from on inbound, to on outbound) resolves to — or creates — a contact.
`started_at / ended_at`	string	Required	ISO 8601. A full record missing either is dropped; a content patch does not need them.
`answered_at`	string	Optional	ISO 8601. Absent or null means the call was never answered.
`duration_seconds`	number	Optional	Derived from ended_at − (answered_at or started_at) when omitted.
`agent`	object	Optional	{ id, email } — matched to the GuestMaker user who handled the call. An email in either field lets us resolve the user without a manual mapping.
`caller`	object	Optional	{ name \| first_name/last_name, email } — the guest's known details. Fills blank contact fields only; never overwrites.
`outcome`	string	Optional	completed \| missed \| no_answer \| voicemail \| free text. missed, no_answer and voicemail store the call as missed.
`recording_url`	string	Optional	Stored verbatim and shown as a play link on the contact. The audio stays on your servers.
`transcript`	array	Optional	[{ speaker, text, offset_ms? }] — feeds guest-memory extraction. Capped at 500 turns / 200,000 characters; oversized pushes are truncated, not rejected.
`transcript_text`	string	Optional	Plain-text alternative. Guest:/Agent: prefixed lines are split into turns when at least two are detected.
`summary`	string	Optional	Your AI summary — shown italicised under the call in the contact's history.
`language, metadata`	string, object	Optional	Merged into the call's metadata. Existing keys are kept; only keys present in the push are added or overwritten.

Caller enrichment. The optional caller object fills only the resolved contact's blank name/email fields — it never overwrites a value already on file. Carrier caller-ID labels ("MOBILE CALLER", "Número privado") and placeholder names are rejected, and an email is applied only if valid and not already owned by another contact.

Idempotency. Re-sending the same call_id updates the record with COALESCE semantics — optional fields a re-push doesn't carry never erase stored content. Guest-memory extraction runs only the first time a transcript arrives.

Content patches. Recording and transcription usually finish minutes after the call. You don't have to re-send the whole record when they do — send call_id plus only the new content, omitting direction, from/to and the timestamps. The patch merges recording_url, transcript, summary, outcome and caller into the existing call and rewrites nothing else. Send as many as you need. A patch is merge-only — it can never create a call, so always send the full record at hangup first; a patch that finds no matching call_id is dropped.

Responses. 200 {"received": true} (processed asynchronously), 401 bad token, 400 invalid JSON, 429 rate limited (backfills should drip and honor retries).

Embedded CTI panel (SDK v1)

Two-way communication between a CTI panel embedded in the dashboard and GuestMaker

<script src="https://www.guestmaker.ai/cti/sdk/v1.js"></script>
<script>
  const gm = await GuestMakerCTI.connect({
    hostOrigin: "https://www.guestmaker.ai"
  });

  gm.agentEmail;  // the GuestMaker user signed in right now
  gm.locale;      // "es"

  await gm.openContactByPhone("+34661024890");
  gm.on("clickToCall", ({ phone }) => dialer.call(phone));
</script>

Methods (panel → GuestMaker)

Parameter	Type	Required	Description
`setPanelMode(mode)`	{ mode }	Required	mode is "docked", "collapsed" or "hidden". Resolves with the mode actually applied, which may differ if the host declines.
`lookupContact(phone)`	{ found, contactId?, displayName? }	Required	E.164 phone. Read-only caller ID — resolves whether a contact exists and its display name, without moving the dashboard. Name only: never email, reservations or history.
`openContactByPhone(phone)`	{ found, contactId? }	Required	E.164 phone. Opens the guest's record on a hit; does not navigate on a miss.
`screenPop(params)`	{ found, contactId?, popped }	Optional	{ phone, callId?, direction?, state? }. Announces a live call in this browser and honours the tenant's screen-pop settings. popped reports whether anything actually happened.
`openContactSearch(query)`	{ shown }	Optional	Free text, max 200 chars. Opens the contacts list with the search prefilled. Returns no records.
`openCreateContact({ phone })`	{ shown }	Optional	Opens the create-contact form prefilled. A human saves it — the call writes nothing.

Events (GuestMaker → panel)

Parameter	Type	Required	Description
`clickToCall`	{ phone, contactId? }	Optional	An agent clicked a phone number anywhere in the dashboard.
`panelModeChanged`	{ mode }	Optional	The agent collapsed or restored the panel from our chrome, so yours can stay in sync.

Error codes

Parameter	Type	Required	Description
`UNKNOWN_METHOD`	host	Optional	Not a method in this protocol version.
`INVALID_PARAMS`	host	Optional	Failed validation; the message names the offending field.
`NOT_FOUND`	host	Optional	Well-formed request, nothing matched.
`NOT_PERMITTED`	host	Optional	Origin or tenant not allowed to make that call.
`TIMEOUT`	sdk	Optional	No response within 10 seconds. Raised locally, not by the host.

The protocol is the contract. The SDK is convenience — you can implement the messages directly. Every message carries gmcti: 1; a request is { gmcti, id, type: "request", method, params } and the reply echoes your id verbatim.

Intents, not guest data. Responses carry booleans, identifiers and applied state — never names, emails, reservations or history. If you need contact data in your own systems, use GET /api/v1/guests?phone= server-to-server with a guests:read key, which also works when no browser tab is open.

Before you can connect. Send us the exact origin your panel is served from — we allowlist it on both the message boundary and our CSP, and nothing loads until we do.

POST

/api/contacts/{contactId}/call

Place an outbound call from the dashboard or your own app

GET

/api/contacts/{contactId}/calls

All calls for a contact, newest first

Screen Pop Modes

Three independent toggles, configured per tenant

Parameter	Type	Required	Description
`auto_navigate`	boolean	Optional	Default true. Current tab navigates to /contacts/{id} on ring.
`notification`	boolean	Optional	Default true. Slide-in banner with caller name + Open Contact button.
`new_tab`	boolean	Optional	Default false. Opens /contacts/{id} in a background tab.
`widget_position`	string	Optional	Provider SDK widget anchor: 'bottom-right' (default) or 'bottom-left'.

Auto-Created Contacts

What happens when an unknown number calls in

Unknown inbound numbers are normalized to E.164 and looked up against your tenant's contact list. If no match is found, GuestMaker creates a minimal contact with source = '{provider}' (e.g. 'ringover'). The screen pop fires with is_new_contact: true so the agent sees a fresh record.

Note: phone matching is exact-equality on E.164. Providers that deliver bare national numbers (without a country code) may produce duplicate contacts. Normalize upstream where possible.

Data Models

Reference documentation for the data structures used throughout the API.

Contact Object

Represents a guest/contact in the system

{
  "id": "uuid",                    // Unique identifier
  "phone": "+1234567890",          // Phone in E.164 format
  "phone_normalized": "1234567890", // Normalized phone (digits only)
  "first_name": "John",
  "last_name": "Doe",
  "email": "john@example.com",
  "language": "en",                // ISO 639-1 language code
  "tags": ["vip", "returning"],    // Array of tags
  "custom_fields": {},             // Custom key-value pairs
  "opt_in_status": "opted_in",     // Legacy (deprecated). Use consent booleans below.
  "subscription_status": "active", // active | unsubscribed (hard block)
  "whatsapp_marketing_consent": true,  // WhatsApp marketing gate
  "email_consent": true,           // Email marketing master gate
  "guest_stage": "pre_stay",       // unknown | pre_stay | during_stay | post_stay
  "hotel_id": "uuid",              // Linked hotel
  "current_reservation_id": "uuid", // Active reservation
  "source": "pms",                 // System type: pms, booking_engine, crm, etc.

  // Personal data fields
  "date_of_birth": "1985-06-15",   // YYYY-MM-DD format
  "gender": "male",                // male | female | other | prefer_not_to_say
  "nationality": "US",             // ISO 3166-1 alpha-2 code
  "document_type": "passport",     // passport | national_id | drivers_license | other
  "document_number": "AB1234567",  // ID document number

  // Consent & subscription fields
  "subscription_status": "active", // active | unsubscribed
  "opted_out_at": null,            // Timestamp when unsubscribed
  "consent_source": "api",         // Where consent was collected
  "consent_partner_id": "uuid",    // Integration partner who collected consent
  "consent_updated_at": "2024-03-01T10:00:00Z",

  "created_at": "2024-03-01T10:00:00Z",
  "updated_at": "2024-03-01T10:00:00Z"
}

Reservation Object

Represents a booking/reservation

{
  "id": "uuid",
  "tenant_id": "uuid",
  "hotel_id": "uuid",
  "localizer_code": "BK-12345",    // Your external booking ID
  "external_id": "BK-12345",       // External system reference
  "source": "hotelinking",         // Canonical origin (e.g. "neobookings", "roiback", "hotelinking", "manual")
  "source_code": "hotelinking",    // Raw value sent by producer (preserved for audit)
  "source_type": "pms",            // pms | booking_engine | manual | api | import
  "attribution_source": null,      // Marketing attribution: e.g. "google_ads", "meta_ads", "booking_com" (null if not supplied)
  "status": "Confirmed",           // Confirmed | Modified | CheckedIn | CheckedOut | Cancelled | NoShow
  "check_in": "2026-03-15",        // Check-in date
  "check_out": "2026-03-18",       // Check-out date
  "nights": 3,                     // Calculated nights
  "room_type": "Deluxe Suite",
  "room_number": "405",
  "board_type": "BB",
  "rate_plan": "Best Available",
  "total_value": 450.00,
  "currency": "EUR",
  "adults": 2,
  "children": 0,
  "notes": "Late checkout requested",
  "created_at": "2024-03-01T10:00:00Z",
  "updated_at": "2024-03-01T10:00:00Z"
}

Guest Stage Lifecycle

Automatic stage tracking based on reservation dates

unknown

No booking data

pre_stay

Before check-in

during_stay

At hotel

post_stay

After checkout

Guest stages are automatically updated by a daily cron job and when booking events are received. The AI assistant uses the guest stage to personalize conversations.

B2B CRM

Ingest travel agencies, tour operators and corporate accounts as first-class B2B entities. Accounts support parent/child hierarchy (up to 3 levels), commercial terms (commissions, credit, promo codes) and matching identifiers that power automatic reservation-to-account production attribution. B2B contacts are regular guest contacts flagged with contact_type: "b2b" and linked to accounts.

Scopes & Module Gating

b2b:read

Required for GET endpoints

b2b:write

Required for POST / PATCH endpoints

All /api/v1/b2b/* endpoints require the B2B CRM module to be enabled for your tenant. Requests without it return 403 MODULE_NOT_ENABLED. Contact your account manager to activate the module.

POST

/api/v1/b2b/accounts

Create a new B2B account or update an existing one. Upsert resolution order: external_id → tax_id → iata_code → insert new.

Required Scope

b2b:write

Request Body

Parameter	Type	Required	Description
`legal_name`	string	Required	Legal company name (max 200 chars)
`trade_name`	string	Optional	Commercial / brand name
`tax_id`	string	Optional	CIF/NIF or international Tax ID. Unique per tenant (case-insensitive) — used for upsert matching and parent_account references
`iata_code`	string	Optional	IATA agency code — also a matching identifier for reservation attribution
`sector`	string	Optional	Industry sector (free text)
`profile`	string	Optional	corporate or mice (default: corporate). Drives which deal flow and account blocks apply
`account_type`	string	Optional	travel_agency, tour_operator, dmc, incentive_agency, corporate_booking, corporate, event_organizer, other
`source`	string	Optional	Where the account came from (free text)
`website`	string	Optional	Company website URL
`email_domains`	string[]	Optional	Up to 20 domains (e.g. @acme.com). Reservation holder emails on these domains generate attribution suggestions
`billing_address`	object	Optional	Fiscal address (see Billing Address Object below)
`billing_details`	object	Optional	Key-value string map (e.g. invoice_email, VAT notes)
`parent_account`	object	Optional	Reference to an existing parent account (see Account Reference Object below). Must resolve (422 PARENT_NOT_FOUND); hierarchy max 3 levels (422 HIERARCHY_TOO_DEEP)
`status`	string	Optional	prospect, active, inactive (default: active)
`promo_codes`	string[]	Optional	Up to 50 promo/rate codes (e.g. CORP_ACME2026). Matched against reservation rate codes for attribution
`commitment_room_nights`	number	Optional	Annual contracted room-night commitment
`contract_start_date`	string	Optional	Contract start (YYYY-MM-DD)
`contract_end_date`	string	Optional	Contract end (YYYY-MM-DD) — drives renewal alerts
`payment_method`	string	Optional	credit or direct
`credit_limit`	number	Optional	Credit limit amount
`payment_days`	number	Optional	Payment terms in days (0–365)
`cancellation_policy`	string	Optional	Agreed cancellation policy (max 2000 chars)
`commission_rate`	number	Optional	Commission percentage on lodging (0–100). Child accounts inherit from the parent when unset
`commission_settlement`	string	Optional	deducted_invoice or post_checkout
`external_id`	string	Optional	Your PMS/CRM identifier. Unique per tenant — the primary upsert key when provided
`channel_manager_code`	string	Optional	Channel manager agency code (matching identifier)
`crs_code`	string	Optional	CRS agency code (matching identifier)
`mirai_agency_id`	string	Optional	Mirai Pro agency id (matching identifier)
`custom_fields`	object	Optional	Free-form key-value pairs

Billing Address Object

Parameter	Type	Required	Description
`line1`	string	Optional	Address line 1
`line2`	string	Optional	Address line 2
`city`	string	Optional	City
`region`	string	Optional	Region / state / province
`postal_code`	string	Optional	Postal code
`country`	string	Optional	ISO 3166-1 alpha-2 uppercase (e.g. ES, US)

Account Reference Object

Used by parent_account here, by account on deals, and by b2b_account on guest ingest. At least one identifier is required. Resolution order: id → external_id → tax_id → iata_code.

Parameter	Type	Required	Description
`id`	string	Optional	GuestMaker account UUID
`external_id`	string	Optional	Your PMS/CRM identifier
`tax_id`	string	Optional	Tax ID (case-insensitive match)
`iata_code`	string	Optional	IATA agency code

Example Request

curl -X POST https://guestmaker.ai/api/v1/b2b/accounts \
  -H "Authorization: Bearer gmkr_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "legal_name": "Viajes Mediterraneo S.L.",
    "trade_name": "Viajes Mediterraneo",
    "tax_id": "B12345678",
    "iata_code": "78212345",
    "profile": "corporate",
    "account_type": "travel_agency",
    "email_domains": ["@viajesmediterraneo.com"],
    "billing_address": {
      "line1": "Calle Gran Via 28",
      "city": "Madrid",
      "postal_code": "28013",
      "country": "ES"
    },
    "commission_rate": 10,
    "commission_settlement": "post_checkout",
    "payment_method": "credit",
    "credit_limit": 50000,
    "payment_days": 30,
    "promo_codes": ["AGMED2026"],
    "commitment_room_nights": 1500,
    "contract_start_date": "2026-01-01",
    "contract_end_date": "2026-12-31",
    "parent_account": { "tax_id": "B87654321" },
    "external_id": "PMS-AG-0042"
  }'

Response

201 when a new account was created, 200 when an existing one was updated.

{
  "success": true,
  "data": {
    "account_id": "550e8400-e29b-41d4-a716-446655440000",
    "is_new": true,
    "message": "Account created successfully"
  }
}

GET

/api/v1/b2b/accounts

List B2B accounts, ordered by most recently updated. Supports incremental sync via updated_since.

PATCH

/api/v1/b2b/accounts/{id}

Partially update an account by UUID — only the fields you send are written. A GET on the same path returns the full account.

POST

/api/v1/b2b/accounts/batch

Create or update up to 500 accounts in a single request. Partial success model — each account is processed independently.

POST

/api/v1/b2b/deals

Create a deal (opportunity) for an existing account. The deal lands in the default pipeline of its flow type, in the first qualification stage.

POST

/api/v1/guests

B2B contacts: the existing guest endpoint accepts contact_type and a b2b_account link — no separate contacts endpoint needed.

Identification & Attribution

How reservations are automatically linked to B2B accounts for production reporting

Every reservation you ingest is matched against your accounts' identifiers in strict priority order. The first match wins; manual links made in the dashboard are never overwritten.

Agency code

The reservation's agency/channel code matches an account's iata_code, channel_manager_code, crs_code or external_id — auto-linked.

Promo / rate code

The stay's rate code matches one of the account's promo_codes (or an open corporate deal's promo code) — auto-linked.

Mirai agency ID

The booking source's Mirai agency identifier matches mirai_agency_id — auto-linked.

Email domain (suggestion only)

The reservation holder's email domain appears in an account's email_domains — surfaced as a suggestion for a human to confirm, never auto-linked.

The more identifiers you send on your accounts (IATA, channel manager codes, promo codes, email domains), the higher your automatic attribution coverage.

B2B Error Codes

400 Bad Request

Invalid request body or query parameters

VALIDATION_ERROR

401 Unauthorized

Invalid or missing API key

UNAUTHORIZED

403 Forbidden

The B2B CRM module is not enabled for this tenant (also FORBIDDEN when the key lacks the b2b scope)

MODULE_NOT_ENABLED

404 Not Found

Account id does not exist for this tenant

NOT_FOUND

422 Unprocessable

parent_account reference does not resolve to an existing account

PARENT_NOT_FOUND

422 Unprocessable

Linking the parent would exceed the 3-level account hierarchy

HIERARCHY_TOO_DEEP

422 Unprocessable

Linking the parent would create a cycle in the hierarchy

HIERARCHY_CYCLE

422 Unprocessable

Deals: the account reference does not resolve to an existing account

ACCOUNT_NOT_FOUND

422 Unprocessable

Deals: no pipeline exists for the flow type (module defaults not seeded)

NO_PIPELINE

429 Too Many Requests

Rate limit exceeded

RATE_LIMITED

Error Handling

Error Response Format

{
  "success": false,
  "error": {
    "message": "Validation failed",
    "code": "VALIDATION_ERROR",
    "details": [
      { "field": "phone", "message": "Phone number is required" },
      { "field": "first_name", "message": "First name is required" }
    ]
  }
}

HTTP Status Codes

200 OK

Request successful

201 Created

Resource created successfully

202 Accepted

Request accepted for async processing

400 Bad Request

Invalid request parameters

VALIDATION_ERROR

401 Unauthorized

Invalid or missing API key

UNAUTHORIZED

403 Forbidden

Insufficient permissions/scopes

FORBIDDEN

404 Not Found

Resource not found

NOT_FOUND

409 Conflict

Resource already exists

CONFLICT

422 Unprocessable

Request understood but cannot be processed

UNPROCESSABLE

429 Too Many Requests

Rate limit exceeded

RATE_LIMITED

500 Internal Error

Server error

INTERNAL_ERROR

503 Service Unavailable

Service temporarily unavailable

SERVICE_UNAVAILABLE

Rate Limits

API requests are rate limited per API key. The default limit is 1,000 requests per minute.

Rate Limit Headers

Parameter	Type	Required	Description
`X-RateLimit-Limit`	number	Required	Maximum requests per minute
`X-RateLimit-Remaining`	number	Required	Requests remaining in current window
`X-RateLimit-Reset`	number	Required	Unix timestamp when the limit resets

Rate Limit Response

HTTP/1.1 429 Too Many Requests
X-RateLimit-Limit: 1000
X-RateLimit-Remaining: 0
X-RateLimit-Reset: 1710507600
Retry-After: 45

{
  "success": false,
  "error": {
    "message": "Rate limit exceeded. Please retry after 45 seconds.",
    "code": "RATE_LIMITED"
  }
}

Need higher limits?

Contact us to discuss higher rate limits for your integration. Enterprise plans include custom limits up to 10,000 requests/minute.

Best Practices

Idempotency

Always include an idempotency_key in event requests to prevent duplicate processing if you need to retry a failed request.

Use a unique, deterministic key (e.g., checkin-{booking_id})
Keys are valid for 24 hours
Same key returns the original response without reprocessing

Error Handling

Implement robust error handling for a reliable integration:

Retry 5xx errors with exponential backoff (2s, 4s, 8s, 16s)
Do not retry 4xx errors - fix the request first
Log error responses for debugging
Monitor rate limit headers to avoid hitting limits
Set reasonable timeouts (30s recommended)

Webhook Reliability

Ensure your webhook endpoints are reliable:

Return 200 OK quickly (within 5 seconds)
Process webhooks asynchronously if needed
Always verify the signature before processing
Implement idempotent processing (webhooks may be delivered more than once)
Use the X-Webhook-Delivery header for deduplication

Phone Number Formatting

Always use E.164 format for phone numbers:

Start with + and country code (e.g., +1 for US, +34 for Spain)
No spaces, dashes, or parentheses
URL-encode the + as %2B in query parameters
Example: +34612345678 (Spain)

Testing

Use our sandbox for development and testing:

Use test API keys (gmkr_test_) for sandbox
Test all error scenarios (validation, auth, rate limits)
Use the interactive sandbox at /developers/sandbox
Test webhook signature verification locally

Bulk Ingestion Guide

Recommended patterns for ingesting large volumes of contacts and bookings

Recommended Integration Flow

Register custom field definitions via POST /api/v1/fields (once)
Send guest + booking data via POST /api/v1/guests
Trigger lifecycle events via POST /api/v1/events

Concurrency & Throughput

Send up to 10 concurrent requests for optimal throughput
Default limit: 1,000 req/min (contact us for higher limits)
Monitor X-RateLimit-Remaining to stay within limits
Implement exponential backoff on 429 responses (2s, 4s, 8s, 16s)

Deduplication & Idempotency

Guest endpoint uses phone-based dedup: sending the same phone number updates the existing contact
Set update_if_exists: true (default) for safe upserts
Reservation dedup uses booking_id + hotel_code as the unique key
Event endpoint uses idempotency_key for dedup (24-hour validity)

Performance Tips

Use hotel_code instead of hotel_name for faster hotel lookups
Register custom field definitions before sending guest data
Include custom_fields in the guest request to populate both JSONB storage and the segment builder
Booking data automatically triggers guest stage calculation and journey events

Initial Data Migration

For initial migrations of 100K+ contacts, contact our team to temporarily increase your rate limits and get a dedicated ingestion window. We can monitor the process in real-time to ensure data integrity.

Ready to integrate?

Request API access to get your credentials and start building.

API Documentation

Everything you need to integrate your systems with our WhatsApp automation platform.

API Version 1.0

Base URL: guestmaker.ai

Quick Start

Get your first API call working in under 5 minutes with this step-by-step guide.

Get your API credentials

Request API access through our partner form or contact your account manager. You will receive:

An API key starting with gmkr_
Your hotel IDs from Settings → Hotels
Documentation on available scopes

Make your first API call

Create a reservation with guest information. This single call creates the reservation, links guests to a hotel, and triggers automation journeys.

curl -X POST https://guestmaker.ai/api/v1/reservations \
  -H "Authorization: Bearer gmkr_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "reservation_id": "RES-2026-001234",
    "confirmation_number": "CONF-ABC123",
    "hotel_name": "Grand Hotel",
    "check_in": "2026-03-15",
    "check_out": "2026-03-18",
    "status": "confirmed",
    "source": "pms",
    "amount": 450.00,
    "amount_net": 371.90,
    "currency": "EUR",
    "channel": "booking.com",
    "market_segment": "LEISURE",
    "agency_code": "AGY-001",
    "external_created_at": "2026-01-20T14:30:00+01:00",
    "external_updated_at": "2026-02-05T09:15:00+01:00",
    "guests": [
      {
        "first_name": "John",
        "last_name": "Doe",
        "email": "john@example.com",
        "phone": "+1234567890",
        "is_holder": true,
        "pax_type": "adult",
        "opt_in_status": "opted_in",
        "nationality": "US",
        "language": "en",
        "document_type": "passport",
        "document_number": "AB1234567"
      },
      {
        "first_name": "Jane",
        "last_name": "Doe",
        "pax_type": "adult"
      }
    ],
    "stays": [
      {
        "start_date": "2026-03-15",
        "end_date": "2026-03-18",
        "room_type": "Deluxe Suite",
        "room_number": "301",
        "board_type": "BB",
        "adults": 2
      }
    ]
  }'

Verify the response

A successful response includes the contact ID and event ID:

{
  "success": true,
  "data": {
    "reservation_id": "550e8400-e29b-41d4-a716-446655440002",
    "contact_id": "550e8400-e29b-41d4-a716-446655440000",
    "hotel_id": "550e8400-e29b-41d4-a716-446655440001",
    "is_new_contact": true,
    "event_id": "550e8400-e29b-41d4-a716-446655440003",
    "message": "Reservation created successfully"
  }
}

Set up webhooks (optional)

Configure webhook endpoints in your dashboard to receive real-time notifications when guests reply or journeys complete.

Explore the full API

Continue reading below to learn about events, webhooks, error handling, and best practices for production integrations.

Authentication

All API requests require authentication using a Bearer token in the Authorization header.

Authorization: Bearer gmkr_your_api_key

API Key Format

API keys are prefixed with gmkr_ for production keys or gmkr_test_ for sandbox keys. Your API key is provided when you set up your integration with us.

Available Scopes

Scope	Description
`guests:read`	Read guest/contact information
`guests:write`	Create/update guests with bookings
`events:write`	Send events to trigger journeys
`bookings:read`	Read reservation data
`bookings:write`	Create/update reservations
`webhooks:manage`	Configure outbound webhooks
`*`	Full access (all scopes)

Security Best Practices

Never expose your API key in client-side code
Store your API key in environment variables
Rotate your API key periodically
Use IP allowlists when possible
Request only the scopes you need

Keep your API key secure

Your API key grants access to your tenant's data. Treat it like a password and never share it publicly.

Reservations API

POST

/api/v1/reservations

Create or update a reservation with guests, stays, and extras. Uses upsert based on reservation_id.

Required Scope

reservations:write

Request Body

Parameter	Type	Required	Description
`reservation_id`	string	Required	Your PMS unique reservation ID (used for upsert matching)
`confirmation_number`	string	Optional	Booking confirmation/localizer code (can be shared across reservations)
`booking_id`	string	Optional	Parent booking ID (for grouping multiple reservations)
`hotel_id`	string	Optional	Hotel UUID (one of hotel_id, hotel_code, or hotel_name required)
`hotel_code`	string	Optional	Hotel code (alternative to hotel_id)
`hotel_name`	string	Optional	Hotel name (alternative to hotel_id)
`check_in`	string	Required	Check-in date (YYYY-MM-DD)
`check_out`	string	Required	Check-out date (YYYY-MM-DD)
`booking_date`	string	Optional	Date the booking was made (YYYY-MM-DD)
`status`	string	Optional	Reservation status: confirmed, pending (booking engine awaiting payment confirmation), modified, cancelled, no_show, checked_in, checked_out
`channel`	string	Optional	Booking channel (e.g., booking.com, expedia, direct)
`source`	string	Optional	System type that sent this data: pms, booking_engine, crm, channel_manager, website, etc. Defaults to "api"
`agency`	string	Optional	Travel agency name
`company`	string	Optional	Corporate booking company
`amount`	number	Optional	Total reservation amount (gross)
`amount_net`	number	Optional	Total reservation amount (net, before tax)
`currency`	string	Optional	ISO 4217 currency code (e.g., EUR, USD)
`market_segment`	string	Optional	PMS market segment code (e.g., "LEISURE", "CORPORATE")
`agency`	string	Optional	Selling agency / tour operator / OTA name (e.g. "BOOKING.COM", "EASYJET HOLIDAYS"). Max 200 chars
`agency_code`	string	Optional	Travel agency code from the PMS, where the source sends one. Max 100 chars
`nights`	number	Optional	Number of nights (accepted but not persisted — auto-computed from dates)
`external_created_at`	string	Optional	PMS creation timestamp (ISO 8601 with timezone)
`external_updated_at`	string	Optional	PMS last-updated timestamp (ISO 8601 with timezone)
`guests`	array	Required	Array of guests (1-20). See Guest Object below.
`stays`	array	Optional	Array of room stays (max 10). See Stay Object below.
`extras`	array	Optional	Array of extras/charges (max 100). See Extra Object below.
`comments`	string	Optional	Internal notes or special requests
`metadata`	object	Optional	Custom key-value data

Guest Object

Parameter	Type	Required	Description
`first_name`	string	Required	Guest first name
`last_name`	string	Optional	Guest last name
`email`	string	Optional	Guest email address. At least one of email or phone is required to create/match a contact.
`phone`	string	Optional	Phone number in E.164 format. At least one of email or phone is required to create/match a contact.
`is_holder`	boolean	Optional	Whether this is the primary guest/booker
`pax_type`	string	Optional	Passenger type: adult, child, infant
`date_of_birth`	string	Optional	Date of birth (YYYY-MM-DD)
`gender`	string	Optional	Guest gender: male, female, other, prefer_not_to_say
`nationality`	string	Optional	ISO 3166-1 alpha-2 country code
`document_type`	string	Optional	ID document type: passport, national_id, drivers_license, other
`document_number`	string	Optional	ID document number (max 50 characters)
`address`	object	Optional	Guest's postal address. All sub-fields optional: street (max 300), city (200), postal_code (40), province (200), state (200), country (ISO 3166-1 alpha-2 or alpha-3, normalized to alpha-2). Longer values are truncated and unrecognized ones dropped — a malformed address never rejects the reservation. A sub-field you omit is left untouched rather than cleared. In Spain, province is the two-digit INE code ("07" for the Balearics). Note country here is the country of RESIDENCE, which is not nationality.
`email_consent`	boolean	Optional	PMS-reported email marketing consent. Takes precedence over CDP auto-consent settings.
`whatsapp_marketing_consent`	boolean	Optional	PMS-reported WhatsApp/phone marketing consent. Takes precedence over CDP auto-consent settings.
`language`	string	Optional	Guest language code (e.g., "en", "es", "fr"). Defaults to "en" for new contacts.
`pre_checkin_completed_at`	string	Optional	ISO 8601 timestamp (with offset) when this guest completed online/pre-checkin in the PMS or booking-engine portal. Omit or send null if the guest hasn't pre-checked-in yet.
`pre_checkin_source`	string	Optional	Where the pre-checkin was completed (e.g., "mews", "cloudbeds", "apaleo", "self_service"). Max 50 chars.

Stay Object

Parameter	Type	Required	Description
`start_date`	string	Required	Stay start date (YYYY-MM-DD)
`end_date`	string	Required	Stay end date (YYYY-MM-DD)
`room_type`	string	Optional	Room type/category
`room_number`	string	Optional	Assigned room number
`board_type`	string	Optional	Meal plan: RO (Room Only), BB (Bed & Breakfast), HB (Half Board), FB (Full Board), AI (All Inclusive)
`rate_code`	string	Optional	Rate code/plan
`adults`	number	Optional	Number of adults
`children`	number	Optional	Number of children
`babies`	number	Optional	Number of infants

Extra Object

Parameter	Type	Required	Description
`name`	string	Required	Charge description
`amount`	number	Required	Charge amount
`code`	string	Optional	Charge code from PMS
`quantity`	number	Optional	Quantity (default: 1)
`date`	string	Optional	Charge date (YYYY-MM-DD)
`notes`	string	Optional	Additional notes

Example Request

curl -X POST https://guestmaker.ai/api/v1/reservations \
  -H "Authorization: Bearer gmkr_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "reservation_id": "RES-2026-001234",
    "confirmation_number": "CONF-ABC123",
    "hotel_name": "Grand Hotel",
    "check_in": "2026-03-15",
    "check_out": "2026-03-18",
    "status": "confirmed",
    "source": "pms",
    "amount": 450.00,
    "amount_net": 371.90,
    "currency": "EUR",
    "channel": "booking.com",
    "market_segment": "LEISURE",
    "agency_code": "AGY-001",
    "external_created_at": "2026-01-20T14:30:00+01:00",
    "external_updated_at": "2026-02-05T09:15:00+01:00",
    "guests": [
      {
        "first_name": "John",
        "last_name": "Doe",
        "email": "john@example.com",
        "phone": "+1234567890",
        "is_holder": true,
        "pax_type": "adult",
        "opt_in_status": "opted_in",
        "nationality": "US",
        "language": "en",
        "document_type": "passport",
        "document_number": "AB1234567"
      },
      {
        "first_name": "Jane",
        "last_name": "Doe",
        "pax_type": "adult"
      }
    ],
    "stays": [
      {
        "start_date": "2026-03-15",
        "end_date": "2026-03-18",
        "room_type": "Deluxe Suite",
        "room_number": "301",
        "board_type": "BB",
        "adults": 2
      }
    ]
  }'

Response

{
  "success": true,
  "data": {
    "reservation_id": "550e8400-e29b-41d4-a716-446655440000",
    "external_reservation_id": "RES-2026-001234",
    "is_new": true,
    "hotel_id": "550e8400-e29b-41d4-a716-446655440001",
    "contacts": [
      {
        "contact_id": "550e8400-e29b-41d4-a716-446655440002",
        "phone": "+1234567890",
        "email": "john@example.com",
        "is_new": true,
        "is_holder": true
      },
      {
        "contact_id": null,
        "phone": null,
        "email": null,
        "is_new": false,
        "is_holder": false
      }
    ],
    "warnings": []
  }
}

Contact Creation

Upsert Behavior

POST

/api/v1/reservations/batch

Create or update up to 50 reservations in a single request. Uses a partial success model — each reservation is processed independently.

Reservation Status Values

Status values and their meaning

Status	Description	Guest Stage
`confirmed`	Reservation confirmed	Pre-arrival
`pending`	Booking engine awaiting payment confirmation	Pre-arrival
`modified`	Reservation modified after confirmation	Pre-arrival
`checked_in`	Guest has arrived	In-house
`checked_out`	Guest has departed	Post-stay
`cancelled`	Reservation cancelled	—
`no_show`	Guest did not arrive	—

Guests API

Create and manage guest contacts with their booking information. Guests are automatically linked to hotels for AI-powered conversations and journey automation.

POST

/api/v1/guests

Create a new guest or update an existing one with booking information

Request Body

Parameter	Type	Required	Description
`phone`	string	Required	Phone number in E.164 format (e.g., +1234567890)
`first_name`	string	Required	Guest's first name
`last_name`	string	Required	Guest's last name
`email`	string	Optional	Guest's email address
`language`	string	Optional	Preferred language code (e.g., en, es, fr). Default: en
`tags`	string[]	Optional	Array of tags for segmentation
`custom_fields`	object	Optional	Key-value pairs matching your registered custom field definitions. See Custom Fields API for setup.
`hotel_name`	string	Optional	Hotel name to link the guest to
`hotel_code`	string	Optional	Hotel code (alternative to hotel_name)
`source`	string	Optional	System type that sent this data: pms, booking_engine, crm, channel_manager, website, etc. Defaults to "api"
`booking`	object	Optional	Booking/reservation details (see below)
`trigger_event`	boolean	Optional	Trigger booking.created event (default: true)
`update_if_exists`	boolean	Optional	Update existing contact by phone (default: true)
`opt_in_status`	string	Optional	Legacy field (deprecated). Use whatsapp_marketing_consent instead.
`whatsapp_marketing_consent`	boolean	Optional	WhatsApp marketing consent (default: false). When true, guest receives marketing WhatsApp messages.
`email_consent`	boolean	Optional	Email marketing consent (default: false). When true, guest receives marketing emails.
`date_of_birth`	string	Optional	Guest date of birth (YYYY-MM-DD)
`gender`	string	Optional	Guest gender: male, female, other, prefer_not_to_say
`nationality`	string	Optional	ISO 3166-1 alpha-2 country code (e.g., US, ES, GB)
`document_type`	string	Optional	ID document type: passport, national_id, drivers_license, other
`document_number`	string	Optional	ID document number (max 50 characters)
`address`	object	Optional	Guest's postal address. All sub-fields optional: street (max 300), city (200), postal_code (40), province (200), state (200), country (ISO 3166-1 alpha-2 or alpha-3, normalized to alpha-2). Longer values are truncated and unrecognized ones dropped — a malformed address never rejects the request. A sub-field you omit is left untouched rather than cleared. In Spain, province is the two-digit INE code ("07" for the Balearics). Note country here is the country of RESIDENCE, which is not nationality.
`subscription_status`	string	Optional	Communication subscription status: active, unsubscribed
`communication_preferences`	object	Optional	Granular communication preferences (see below)
`consent_source`	string	Optional	Your identifier for where consent was collected
`consent_timestamp`	string	Optional	ISO 8601 timestamp when consent was given

Booking Object

Parameter	Type	Required	Description
`booking_id`	string	Required	Parent booking ID (groups multiple reservations, e.g., Expedia booking with 4 rooms)
`reservation_id`	string	Optional	Individual reservation/localizer code (defaults to booking_id if not provided)
`check_in`	string	Required	Check-in date (YYYY-MM-DD)
`check_out`	string	Required	Check-out date (YYYY-MM-DD)
`room_type`	string	Optional	Room type/category
`room_number`	string	Optional	Assigned room number (if known)
`rate_plan`	string	Optional	Rate plan name
`board_type`	string	Optional	Meal plan: RO (Room Only), BB (Bed & Breakfast), HB (Half Board), FB (Full Board), AI (All Inclusive)
`booking_channel`	string	Optional	Raw PMS channel code (e.g. BDC, EXP). Stored as booking_channel_code. Auto-resolved to human-readable name and channel type (direct/ota/tour_operator) if tenant has mappings configured.
`total_amount`	number	Optional	Total booking amount
`currency`	string	Optional	Currency code (default: EUR)
`status`	string	Optional	Confirmed, Modified, CheckedIn, CheckedOut, Cancelled, NoShow
`guests`	array	Optional	Additional guests on the booking (see Booking Guests below)
`extras`	array	Optional	Booking extras like spa, minibar, restaurant (see Booking Extras below)

Booking Guests Array

Parameter	Type	Required	Description
`first_name`	string	Required	Guest's first name
`last_name`	string	Optional	Guest's last name
`email`	string	Optional	Guest's email address
`is_holder`	boolean	Optional	Whether this guest is the reservation holder (default: false)
`pax_type`	string	Optional	Adult, Child, or Infant
`relationship_to_holder`	string	Optional	Spouse, Child, Colleague, Friend, etc.
`pre_checkin_completed_at`	string	Optional	ISO 8601 timestamp (with offset) when this companion guest completed online/pre-checkin.
`pre_checkin_source`	string	Optional	Where the pre-checkin was completed (e.g., "mews", "cloudbeds", "self_service"). Max 50 chars.

Booking Extras Array

Parameter	Type	Required	Description
`name`	string	Required	Extra name (e.g., Spa Services, Minibar, Restaurant)
`amount`	number	Required	Amount charged
`quantity`	number	Optional	Quantity (default: 1)
`notes`	string	Optional	Additional notes or description

Communication Preferences Object (legacy)

Legacy communication preferences. Prefer using whatsapp_marketing_consent and email_consent boolean fields directly on the guest object.

Parameter	Type	Required	Description
`marketing`	boolean	Optional	Consent to receive marketing messages (promotions, offers). Default: false. Maps to whatsapp_marketing_consent.
`utility`	boolean	Optional	Utility messages (booking confirmations, reminders) are always delivered. This field is ignored.

Note: When a guest unsubscribes via WhatsApp chat, they can choose to stop all communications or only marketing messages while keeping utility messages active.

Example Request

curl -X POST https://guestmaker.ai/api/v1/guests \
  -H "Authorization: Bearer gmkr_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "phone": "+1234567890",
    "first_name": "John",
    "last_name": "Doe",
    "email": "john@example.com",
    "nationality": "US",
    "document_type": "passport",
    "document_number": "AB1234567",
    "source": "pms",
    "hotel_name": "Grand Hotel",
    "booking": {
      "booking_id": "BK-12345",
      "check_in": "2026-03-15",
      "check_out": "2026-03-18",
      "room_type": "Deluxe Suite",
      "total_amount": 450.00,
      "status": "Confirmed"
    }
  }'

Response

{
  "success": true,
  "data": {
    "contact_id": "550e8400-e29b-41d4-a716-446655440000",
    "is_new": true,
    "hotel_id": "550e8400-e29b-41d4-a716-446655440001",
    "reservation_id": "550e8400-e29b-41d4-a716-446655440002",
    "event_id": "550e8400-e29b-41d4-a716-446655440003",
    "message": "Guest created successfully"
  }
}

POST

/api/v1/guests/batch

Create or update up to 500 guests in a single request. Uses a partial success model — each guest is processed independently.

GET

/api/v1/guests

Retrieve a guest by phone number with their reservations

Events API

Send events to trigger journey automations. Events are matched against active journey triggers to start automated WhatsApp conversations.

POST

/api/v1/events

Create an event to trigger matching journey automations

Request Body

Parameter	Type	Required	Description
`event_type`	string	Required	Event type identifier (e.g., guest.checked_in)
`payload`	object	Required	Event data available in journey context
`contact_id`	string	Optional	Contact UUID (if known)
`guest_phone`	string	Optional	Phone number to identify the contact (E.164)
`hotel_id`	string	Optional	Hotel UUID (if known)
`hotel_name`	string	Optional	Hotel name to resolve hotel_id
`hotel_code`	string	Optional	Hotel code to resolve hotel_id
`idempotency_key`	string	Optional	Unique key to prevent duplicate events
`source`	string	Optional	Source system identifier for tracking

Standard Event Types

These standard event types are recognized by the system. You can also create custom event types.

booking.created

New booking received

booking.updated

Booking modified

booking.cancelled

Booking cancelled

guest.checked_in

Guest arrived

guest.checked_out

Guest departed

guest.message

Guest sent message

payment.received

Payment confirmed

review.requested

Review requested

Custom event types should follow the pattern category.action (e.g., spa.appointment_booked)

Example Request

curl -X POST https://guestmaker.ai/api/v1/events \
  -H "Authorization: Bearer gmkr_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "event_type": "guest.checked_in",
    "guest_phone": "+1234567890",
    "hotel_name": "Grand Hotel",
    "payload": {
      "room_number": "301",
      "checked_in_at": "2026-03-15T14:30:00Z"
    },
    "idempotency_key": "checkin-BK-12345"
  }'

Response

{
  "success": true,
  "data": {
    "event_id": "550e8400-e29b-41d4-a716-446655440000",
    "status": "accepted",
    "contact_id": "550e8400-e29b-41d4-a716-446655440001",
    "hotel_id": "550e8400-e29b-41d4-a716-446655440002",
    "matching_journeys": 2,
    "created_at": "2026-03-15T14:30:00Z",
    "message": "Event accepted and queued for processing"
  }
}

Idempotency

Always include an idempotency_key to prevent duplicate events. If you send the same idempotency key twice, the second request returns the original event.

GET

/api/v1/events

List available event types for your tenant

Custom Fields API

POST

/api/v1/fields

Create or update custom field definitions. Uses upsert based on field_key — sending an existing key updates it.

Required Scope

custom_fields:write

Request Body

Parameter	Type	Required	Description
`fields`	array	Required	Array of field definitions (max 50)
`fields[].field_key`	string	Required	Unique key (lowercase, a-z, 0-9, underscores, must start with letter)
`fields[].field_label`	string	Required	Display label shown to hotel staff
`fields[].field_type`	string	Required	One of: string, text, number, boolean, date, datetime, select, multiselect
`fields[].options`	string[]	Optional	Required for select/multiselect types
`fields[].description`	string	Optional	Help text for hotel staff
`fields[].is_required`	boolean	Optional	Whether field must have a value (default: false)
`fields[].is_visible`	boolean	Optional	Show in contact details UI (default: true)
`fields[].display_order`	number	Optional	Sort order within your fields (default: 0)

Example Request

curl -X POST https://guestmaker.ai/api/v1/fields \
  -H "Authorization: Bearer gmkr_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "fields": [
      {
        "field_key": "loyalty_tier",
        "field_label": "Loyalty Tier",
        "field_type": "select",
        "options": ["Bronze", "Silver", "Gold", "Platinum"],
        "description": "Guest loyalty program tier"
      },
      {
        "field_key": "loyalty_points",
        "field_label": "Loyalty Points",
        "field_type": "number",
        "description": "Current loyalty point balance"
      },
      {
        "field_key": "member_since",
        "field_label": "Member Since",
        "field_type": "date"
      }
    ]
  }'

Response

{
  "success": true,
  "data": {
    "fields": [
      { "field_key": "loyalty_tier", "field_label": "Loyalty Tier", "field_type": "select", "created_at": "2026-01-31T10:00:00Z", "updated_at": "2026-01-31T10:00:00Z" },
      { "field_key": "loyalty_points", "field_label": "Loyalty Points", "field_type": "number", "created_at": "2026-01-31T10:00:00Z", "updated_at": "2026-01-31T10:00:00Z" },
      { "field_key": "member_since", "field_label": "Member Since", "field_type": "date", "created_at": "2026-01-31T10:00:00Z", "updated_at": "2026-01-31T10:00:00Z" }
    ],
    "message": "3 field definition(s) created/updated successfully"
  }
}

GET

/api/v1/fields

List all custom field definitions registered by your integration

Integration with Segments

Field Types Reference

Supported field types and their expected values

Type	Description	Example Value
`string`	Short text (single line)	`"John Doe"`
`text`	Long text (multi-line)	`"Special dietary requirements..."`
`number`	Numeric value	`1500`
`boolean`	True/false	`true`
`date`	Date (YYYY-MM-DD)	`"2026-03-15"`
`datetime`	Date and time (ISO 8601)	`"2026-03-15T14:30:00Z"`
`select`	Single choice from options	`"Gold"`
`multiselect`	Multiple choices from options	`["spa", "golf"]`

CDP API

GuestMaker.js SDK

For website tracking, use the GuestMaker.js SDK which handles visitor ID management, event batching, and automatic page view tracking. See the SDKs page for setup instructions.

Domain Restrictions

POST

/api/v1/cdp/events

Submit batched visitor tracking events from your website's tracking snippet. Returns 202 Accepted -- events are processed asynchronously.

Required Scope

cdp:write

Requires visitor tracking to be enabled in CDP Settings.

Request Body

Parameter	Type	Required	Description
`visitor_id`	string	Required	Anonymous visitor identifier (from SDK cookie)
`session_id`	string	Required	Session identifier (from SDK sessionStorage)
`device`	object	Optional	{ type: "desktop"\|"mobile"\|"tablet", browser, os, language }
`utm`	object	Optional	{ source, medium, campaign, term, content }
`referrer`	string	Optional	HTTP referrer URL
`events`	array	Required	Array of event objects (1-100). See Event Object below.

Event Object

Parameter	Type	Required	Description
`type`	string	Required	Event type: page_view, scroll, click, form_start, form_submit, identify, custom
`url`	string	Optional	Page URL (domain stripped server-side for privacy)
`title`	string	Optional	Page title
`data`	object	Optional	Custom event data (e.g., scroll depth, click element)
`ts`	string	Required	ISO 8601 timestamp

Example Request

curl -X POST https://guestmaker.ai/api/v1/cdp/events \
  -H "Authorization: Bearer gmkr_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "visitor_id": "vis_abc123def456",
    "session_id": "sess_789xyz",
    "device": {
      "type": "desktop",
      "browser": "Chrome 120",
      "os": "Windows 11",
      "language": "en-US"
    },
    "utm": {
      "source": "google",
      "medium": "cpc",
      "campaign": "summer-2026"
    },
    "referrer": "https://www.google.com/search?q=luxury+hotels",
    "events": [
      {
        "type": "page_view",
        "url": "/rooms/deluxe-suite",
        "title": "Deluxe Suite | Grand Hotel",
        "ts": "2026-02-19T14:30:00.000Z"
      },
      {
        "type": "scroll",
        "url": "/rooms/deluxe-suite",
        "data": { "depth": 75 },
        "ts": "2026-02-19T14:30:45.000Z"
      },
      {
        "type": "click",
        "url": "/rooms/deluxe-suite",
        "data": { "element": "book-now-btn", "text": "Book Now" },
        "ts": "2026-02-19T14:31:02.000Z"
      }
    ]
  }'

Response (202 Accepted)

{
  "success": true,
  "data": {
    "accepted": 3
  }
}

POST

/api/v1/cdp/identify

Link an anonymous visitor to a known identity (email, phone, name). Creates or links a CDP profile and enriches the visitor record.

POST

/api/v1/cdp/reservations

Ingest a single post-checkout reservation with guests and extras for identity resolution. Uses the CDP-specific ingestion pipeline (separate from the main Reservations API).

POST

/api/v1/cdp/reservations/batch

Synchronous batch of up to 100 reservations. Each reservation is processed independently with partial success semantics.

POST

/api/v1/cdp/reservations/bulk

Async bulk ingestion of up to 5,000 reservations. Returns 202 Accepted with a batch_id for status polling.

GET

/api/v1/cdp/batches/{id}

Check the status of a bulk ingestion batch. Poll this endpoint after submitting a bulk ingestion request.

Loyalty API

Server-to-server

Server REST API

Your backend acts for the hotel with an API key. Look up any guest by email; enroll, award, redeem, sync points and cash credit.

Auth · Authorization: Bearer <api_key>

Endpoints below

Guest sign-in · OIDC

Loyalty SSO (OIDC)

The guest signs in with their loyalty account (OAuth2 + PKCE). Read only that guest’s tier, balance and history to personalise the booking flow.

Auth · per-guest tokens (id_token + Bearer access token)

Integration guide

GET

/api/v1/loyalty/check

Quick check whether an email address is enrolled in the loyalty program

Query Parameters

Parameter	Type	Required	Description
`email`	string	Required	Guest email address

Response (Member Found)

{
  "success": true,
  "data": {
    "is_member": true,
    "member_summary": {
      "member_id": "uuid",
      "tier_name": "Gold",
      "tier_slug": "gold",
      "points_balance": 1500,
      "lifetime_points": 3000,
      "joined_at": "2025-01-15T10:30:00Z"
    }
  }
}

Response (Not a Member)

{
  "success": true,
  "data": {
    "is_member": false,
    "member_summary": null
  }
}

POST

/api/v1/loyalty/enroll

Enroll a new member in the loyalty program (creates contact if needed)

POST

/api/v1/loyalty/unsubscribe

Deactivate a member (leave the program). The inverse of enroll — keeps points, blocks SSO sign-in, and is reversible by re-enrolling.

GET

/api/v1/loyalty/member

Retrieve full loyalty member details including tier, points, and available rewards

POST

/api/v1/loyalty/points

Award points to a loyalty member (e.g., for bookings, referrals, promotions)

POST

/api/v1/loyalty/redeem

Redeem a reward for a loyalty member. Designed for PMS / POS / booking-engine auto-ingest at scale (idempotent + auto-fulfilled supported).

POST

/api/v1/loyalty/redemptions/batch

Submit up to 100 redemptions in a single call. Each item is independently processed + independently idempotent. Built for nightly reconciliation jobs across a hotel group.

GET

/api/v1/loyalty/rewards

List all available rewards with optional category filtering and pagination

GET

/api/v1/loyalty/tiers

Retrieve all loyalty program tiers with benefits and qualification thresholds

GET

/api/v1/loyalty/transactions

Retrieve points transaction history for a loyalty member

GET

/api/v1/loyalty/calculate

Calculate how many points would be earned for a given spend amount

More REST endpoints — same Bearer auth and response envelope, grouped for completeness.

Earning & adjustments guests:write

POST /api/v1/loyalty/actions — award a non-stay action bonus (review, survey, app download)
POST /api/v1/loyalty/points/confirm — confirm a pending earn into the live balance
POST /api/v1/loyalty/points/void — void a pending earn before confirmation
POST /api/v1/loyalty/reverse — reverse earned points on cancellation / no-show
POST /api/v1/loyalty/apply-discount — spend points as a currency discount on a booking/POS
POST /api/v1/loyalty/redeem-free-night — redeem points for a free-night voucher code

Advanced

GET /api/v1/loyalty/conversion — points ↔ currency calculator guests:read
GET /api/v1/loyalty/households · POST — household pool balance & pooled redemption
GET /api/v1/loyalty/liability — points-liability & program-health report guests:read
POST /api/v1/loyalty/experiences/bid — bid points on an auction experience

Authentication & Scopes

JavaScript SDK Available

A client-side JavaScript SDK wraps the core loyalty endpoints with automatic header injection and error handling.

Cash Credit

New

Overview

Lifecycle diagram, surfaces, error codes, and the OTA denylist.

Booking engine

5-minute drop-in <script> embed with apply callback.

PMS

/reservation-snapshot + 5 HMAC webhooks for real-time balance sync.

Endpoints (scope guests:write)

GET /api/v1/loyalty/credit/quote — read spendable + presets
POST /api/v1/loyalty/credit/hold — reserve points (atomic, idempotent on external_reference_id)
POST /api/v1/loyalty/credit/confirm — commit deduction
POST /api/v1/loyalty/credit/release — release an active hold
POST /api/v1/loyalty/credit/reverse — claw back after cancellation
GET /api/v1/loyalty/reservation-snapshot — PMS folio render in one call

Loyalty SSO (OIDC)

Integration guide

The flow, scopes & claims, mandatory security requirements, token model, and endpoints.

Booking engine quickstart

A copy-paste, framework-neutral walkthrough — authorize URL, PKCE, token exchange, id_token verification, and reading member data.

Endpoints (Authorization Code + PKCE)

GET /api/oidc/.well-known/openid-configuration — discovery (load endpoints + JWKS from here)
GET /api/oidc/auth — authorize (browser redirect, PKCE S256)
POST /api/oidc/token — token exchange (client_secret_basic)
GET /api/oidc/jwks — RS256 public signing keys
GET /api/loyalty/me/balance — member tier + points (Bearer)
GET /api/loyalty/me/transactions — points history (Bearer)

Newsletter Signup

Quick install (zero-code drop-in)

<div data-gm-newsletter
     data-token="gm_pub_your_publishable_key"
     data-fields="email"></div>
<script src="https://www.guestmaker.ai/sdk/guestmaker.js" async></script>

Or build your own UI and call the SDK headlessly:

GuestMaker.newsletter.subscribe({
  email: 'guest@example.com',
  token: 'gm_pub_your_publishable_key'
}).then(function (r) {
  // r.status === 'pending' | 'subscribed'
})

Always use the host https://www.guestmaker.ai — the apex domain redirects and drops the auth header.

POST

/api/v1/newsletter/subscribe

Subscribe an email address. Double opt-in sends a confirmation email; single opt-in subscribes immediately.

Authentication

Either way, the newsletter widget must first be activated in Settings → Email → Newsletter Signup; a 403 with Newsletter signup not enabled means no active config exists yet.

Backend example (server-to-server)

curl -X POST https://www.guestmaker.ai/api/v1/newsletter/subscribe \
  -H "Authorization: Bearer gmkr_your_secret_key" \
  -H "Content-Type: application/json" \
  -d '{
    "email": "guest@example.com",
    "consent": true,
    "source": "booking_engine"
  }'

Request Body

Parameter	Type	Required	Description
`email`	string	Required	Subscriber email (max 254)
`consent`	true	Required	Explicit consent; rejected if absent or false
`first_name`	string	Optional	Only stored if the first_name field is enabled in your config
`language`	string	Optional	ISO 639-1 (max 10), normalised to lowercase
`hotel_id`	UUID	Optional	Property of interest; validated against your active hotels
`source`	string	Optional	Free-form provenance label (max 200)
`turnstile_token`	string	Optional	Cloudflare Turnstile token, when Turnstile is enabled
`_hp`	string	Optional	Honeypot — must be empty; a non-empty value is silently treated as a bot

Response (200)

{ "status": "pending" }

GET

/api/public/newsletter/confirm

Two-step double opt-in confirmation (browser-facing, not a JSON API)

GET

/api/v1/newsletter/config

Presentation-only config the drop-in widget uses to self-render

Webhooks

Receive real-time notifications when events occur in the platform. Configure webhook endpoints in your dashboard settings.

Available Webhook Events

Events that can be delivered to your webhook endpoints

message.receivedIncoming message

message.sentOutgoing message sent

message.deliveredMessage delivered

message.readMessage read by recipient

contact.createdNew contact added

contact.updatedContact info changed

contact.deletedContact deleted

conversation.createdNew conversation started

conversation.closedConversation closed

journey.startedJourney automation began

journey.completedJourney automation finished

journey.failedJourney execution error

broadcast.sentBroadcast campaign sent

broadcast.completedBroadcast finished

reservation.checked_inGuest checked in (daily date-scan — see note)

reservation.checked_outGuest checked out (daily date-scan — see note)

Webhook Payload Format

All webhooks follow this consistent format

{
  "event_type": "contact.created",
  "timestamp": "2026-03-15T10:30:00Z",
  "data": {
    "contact": {
      "id": "550e8400-e29b-41d4-a716-446655440000",
      "phone": "+1234567890",
      "first_name": "John",
      "last_name": "Doe",
      "email": "john@example.com",
      "hotel_id": "550e8400-e29b-41d4-a716-446655440001"
    }
  }
}

Reservation events carry the booking, the guest, and the scheduled_for hint:

{
  "event_type": "reservation.checked_in",
  "timestamp": "2026-07-10T03:12:08Z",
  "data": {
    "reservation": {
      "id": "…", "hotel_id": "…", "status": "CheckedIn",
      "check_in": "2026-07-10", "check_out": "2026-07-12",
      "localizer_code": "ABC123", "booking_id": "…",
      "source": "…", "booking_channel": "…", "total_value": 540, "currency": "EUR"
    },
    "contact": {
      "id": "…", "first_name": "John", "last_name": "Doe",
      "email": "john@example.com", "phone": "+34600000000",
      "language": "en", "nationality": "GB"
    },
    "scheduled_for": {
      "date": "2026-07-10", "local_time": "15:00",
      "timezone": "Europe/Madrid", "iso": "2026-07-10T13:00:00.000Z"
    }
  }
}

Security Headers

Headers included with every webhook request

Parameter	Type	Required	Description
`X-Webhook-Signature`	string	Required	HMAC-SHA256 signature: sha256=...
`X-Webhook-Event`	string	Required	The event type being delivered
`X-Webhook-Delivery`	string	Required	Unique delivery ID (UUID)
`X-Webhook-Timestamp`	string	Required	ISO 8601 timestamp of the event

Verifying Signatures

Always verify webhook signatures to ensure requests are authentic

const crypto = require('crypto');

// Sign over `timestamp + "." + rawBody` (the timestamp is signed for replay
// resistance). Verify against the RAW request body, never a re-serialized object.
function verifyWebhookSignature(rawBody, timestamp, signature, secret) {
  const expected = crypto
    .createHmac('sha256', secret)
    .update(`${timestamp}.${rawBody}`)
    .digest('hex');

  return `sha256=${expected}` === signature;
}

// Capture the raw body (do NOT re-serialize req.body):
app.use('/webhook', express.raw({ type: 'application/json' }));
app.post('/webhook', (req, res) => {
  const rawBody = req.body.toString('utf8');
  const timestamp = req.headers['x-webhook-timestamp'];
  const signature = req.headers['x-webhook-signature'];

  if (!verifyWebhookSignature(rawBody, timestamp, signature, 'your_webhook_secret')) {
    return res.status(401).send('Invalid signature');
  }
  // Replay protection: reject stale timestamps (±5 min); dedup on X-Webhook-Delivery.
  if (Math.abs(Date.now() - new Date(timestamp).getTime()) > 5 * 60 * 1000) {
    return res.status(401).send('Stale timestamp');
  }

  const { event_type, data } = JSON.parse(rawBody);
  console.log(`Received event: ${event_type}`, data);

  res.status(200).send('OK');
});

CTI / Telephony

Setup

Connecting a CTI provider to GuestMaker

Step 1. In the dashboard, open Settings → Integrations → {Provider} and click Connect.

Step 3. In your provider's dashboard, configure a webhook with that URL and token. Enable these events: call_ringing, call_answered, call_hangup, call_missed, record_available.

Step 4. Click Test connection — a simulated incoming call fires the screen pop in your dashboard.

Step 5. Configure screen-pop modes (auto-navigate, notification banner, new-tab) and the widget position. Agents are auto-mapped from your provider's user list by email.

Webhook Events

Call lifecycle events GuestMaker accepts from every CTI provider

call_ringingCall ringing — triggers contact lookup + screen pop

call_answeredCall picked up by an agent

call_hangupCall ended (carries duration in seconds)

call_missedCall not answered

record_availableRecording URL ready

call_completedOne post-call record (metadata + optional transcript/summary) — see Completed-Call Push below

Webhook Authentication

Bearer-token auth in the Authorization header, timing-safe-compared per request

POST /api/webhooks/cti
Authorization: Bearer <your_webhook_token>
Content-Type: application/json

{
  "event_type": "call_ringing",
  "call_id": "ringover-abc-123",
  "user_id": "ringover-user-42",
  "from_number": "+34612345678",
  "to_number": "+34900111222",
  "direction": "inbound"
}

Field names are accepted in either snake_case or camelCase, and may also appear nested under a data object. Per-tenant rate limit: 100 requests/minute.

Completed-Call Push (call_completed)

Send one record per finished call — for providers that push call details after hang-up, instead of (or alongside) the live lifecycle events

POST /api/webhooks/cti
Authorization: Bearer <your_webhook_token>
Content-Type: application/json

{
  "event": "call_completed",
  "call_id": "zn-8f3a2c91",
  "direction": "inbound",
  "from": "+34600111222",
  "to": "+34971000000",
  "agent": { "id": "zoon-user-42", "email": "agent@hotel.com" },
  "caller": { "name": "María García", "email": "maria@example.com" },
  "started_at": "2026-07-16T10:31:04Z",
  "answered_at": "2026-07-16T10:31:12Z",
  "ended_at": "2026-07-16T10:35:49Z",
  "outcome": "completed",
  "recording_url": "https://rec.example.com/zn-8f3a2c91.mp3",
  "summary": "Guest asked about a late checkout on the 18th.",
  "transcript": [
    { "speaker": "guest", "text": "Hola, quería un late checkout.", "offset_ms": 0 },
    { "speaker": "agent", "text": "Claro, dígame su habitación.", "offset_ms": 4200 }
  ]
}

Request Body

Parameter	Type	Required	Description
`event`	string	Required	The literal "call_completed".
`call_id`	string	Required	Your stable unique id — the sole idempotency key, scoped per (tenant, provider).
`direction`	string	Required	inbound or outbound. Omit it entirely to send a content patch (see below).
`from / to`	string	Required	E.164 numbers. The guest side (from on inbound, to on outbound) resolves to — or creates — a contact.
`started_at / ended_at`	string	Required	ISO 8601. A full record missing either is dropped; a content patch does not need them.
`answered_at`	string	Optional	ISO 8601. Absent or null means the call was never answered.
`duration_seconds`	number	Optional	Derived from ended_at − (answered_at or started_at) when omitted.
`agent`	object	Optional	{ id, email } — matched to the GuestMaker user who handled the call. An email in either field lets us resolve the user without a manual mapping.
`caller`	object	Optional	{ name \| first_name/last_name, email } — the guest's known details. Fills blank contact fields only; never overwrites.
`outcome`	string	Optional	completed \| missed \| no_answer \| voicemail \| free text. missed, no_answer and voicemail store the call as missed.
`recording_url`	string	Optional	Stored verbatim and shown as a play link on the contact. The audio stays on your servers.
`transcript`	array	Optional	[{ speaker, text, offset_ms? }] — feeds guest-memory extraction. Capped at 500 turns / 200,000 characters; oversized pushes are truncated, not rejected.
`transcript_text`	string	Optional	Plain-text alternative. Guest:/Agent: prefixed lines are split into turns when at least two are detected.
`summary`	string	Optional	Your AI summary — shown italicised under the call in the contact's history.
`language, metadata`	string, object	Optional	Merged into the call's metadata. Existing keys are kept; only keys present in the push are added or overwritten.

Responses. 200 {"received": true} (processed asynchronously), 401 bad token, 400 invalid JSON, 429 rate limited (backfills should drip and honor retries).

Embedded CTI panel (SDK v1)

Two-way communication between a CTI panel embedded in the dashboard and GuestMaker

<script src="https://www.guestmaker.ai/cti/sdk/v1.js"></script>
<script>
  const gm = await GuestMakerCTI.connect({
    hostOrigin: "https://www.guestmaker.ai"
  });

  gm.agentEmail;  // the GuestMaker user signed in right now
  gm.locale;      // "es"

  await gm.openContactByPhone("+34661024890");
  gm.on("clickToCall", ({ phone }) => dialer.call(phone));
</script>

Methods (panel → GuestMaker)

Parameter	Type	Required	Description
`setPanelMode(mode)`	{ mode }	Required	mode is "docked", "collapsed" or "hidden". Resolves with the mode actually applied, which may differ if the host declines.
`lookupContact(phone)`	{ found, contactId?, displayName? }	Required	E.164 phone. Read-only caller ID — resolves whether a contact exists and its display name, without moving the dashboard. Name only: never email, reservations or history.
`openContactByPhone(phone)`	{ found, contactId? }	Required	E.164 phone. Opens the guest's record on a hit; does not navigate on a miss.
`screenPop(params)`	{ found, contactId?, popped }	Optional	{ phone, callId?, direction?, state? }. Announces a live call in this browser and honours the tenant's screen-pop settings. popped reports whether anything actually happened.
`openContactSearch(query)`	{ shown }	Optional	Free text, max 200 chars. Opens the contacts list with the search prefilled. Returns no records.
`openCreateContact({ phone })`	{ shown }	Optional	Opens the create-contact form prefilled. A human saves it — the call writes nothing.

Events (GuestMaker → panel)

Parameter	Type	Required	Description
`clickToCall`	{ phone, contactId? }	Optional	An agent clicked a phone number anywhere in the dashboard.
`panelModeChanged`	{ mode }	Optional	The agent collapsed or restored the panel from our chrome, so yours can stay in sync.

Error codes

Parameter	Type	Required	Description
`UNKNOWN_METHOD`	host	Optional	Not a method in this protocol version.
`INVALID_PARAMS`	host	Optional	Failed validation; the message names the offending field.
`NOT_FOUND`	host	Optional	Well-formed request, nothing matched.
`NOT_PERMITTED`	host	Optional	Origin or tenant not allowed to make that call.
`TIMEOUT`	sdk	Optional	No response within 10 seconds. Raised locally, not by the host.

Before you can connect. Send us the exact origin your panel is served from — we allowlist it on both the message boundary and our CSP, and nothing loads until we do.

POST

/api/contacts/{contactId}/call

Place an outbound call from the dashboard or your own app

GET

/api/contacts/{contactId}/calls

All calls for a contact, newest first

Screen Pop Modes

Three independent toggles, configured per tenant

Parameter	Type	Required	Description
`auto_navigate`	boolean	Optional	Default true. Current tab navigates to /contacts/{id} on ring.
`notification`	boolean	Optional	Default true. Slide-in banner with caller name + Open Contact button.
`new_tab`	boolean	Optional	Default false. Opens /contacts/{id} in a background tab.
`widget_position`	string	Optional	Provider SDK widget anchor: 'bottom-right' (default) or 'bottom-left'.

Auto-Created Contacts

What happens when an unknown number calls in

Note: phone matching is exact-equality on E.164. Providers that deliver bare national numbers (without a country code) may produce duplicate contacts. Normalize upstream where possible.

Data Models

Reference documentation for the data structures used throughout the API.

Contact Object

Represents a guest/contact in the system

{
  "id": "uuid",                    // Unique identifier
  "phone": "+1234567890",          // Phone in E.164 format
  "phone_normalized": "1234567890", // Normalized phone (digits only)
  "first_name": "John",
  "last_name": "Doe",
  "email": "john@example.com",
  "language": "en",                // ISO 639-1 language code
  "tags": ["vip", "returning"],    // Array of tags
  "custom_fields": {},             // Custom key-value pairs
  "opt_in_status": "opted_in",     // Legacy (deprecated). Use consent booleans below.
  "subscription_status": "active", // active | unsubscribed (hard block)
  "whatsapp_marketing_consent": true,  // WhatsApp marketing gate
  "email_consent": true,           // Email marketing master gate
  "guest_stage": "pre_stay",       // unknown | pre_stay | during_stay | post_stay
  "hotel_id": "uuid",              // Linked hotel
  "current_reservation_id": "uuid", // Active reservation
  "source": "pms",                 // System type: pms, booking_engine, crm, etc.

  // Personal data fields
  "date_of_birth": "1985-06-15",   // YYYY-MM-DD format
  "gender": "male",                // male | female | other | prefer_not_to_say
  "nationality": "US",             // ISO 3166-1 alpha-2 code
  "document_type": "passport",     // passport | national_id | drivers_license | other
  "document_number": "AB1234567",  // ID document number

  // Consent & subscription fields
  "subscription_status": "active", // active | unsubscribed
  "opted_out_at": null,            // Timestamp when unsubscribed
  "consent_source": "api",         // Where consent was collected
  "consent_partner_id": "uuid",    // Integration partner who collected consent
  "consent_updated_at": "2024-03-01T10:00:00Z",

  "created_at": "2024-03-01T10:00:00Z",
  "updated_at": "2024-03-01T10:00:00Z"
}

Reservation Object

Represents a booking/reservation

{
  "id": "uuid",
  "tenant_id": "uuid",
  "hotel_id": "uuid",
  "localizer_code": "BK-12345",    // Your external booking ID
  "external_id": "BK-12345",       // External system reference
  "source": "hotelinking",         // Canonical origin (e.g. "neobookings", "roiback", "hotelinking", "manual")
  "source_code": "hotelinking",    // Raw value sent by producer (preserved for audit)
  "source_type": "pms",            // pms | booking_engine | manual | api | import
  "attribution_source": null,      // Marketing attribution: e.g. "google_ads", "meta_ads", "booking_com" (null if not supplied)
  "status": "Confirmed",           // Confirmed | Modified | CheckedIn | CheckedOut | Cancelled | NoShow
  "check_in": "2026-03-15",        // Check-in date
  "check_out": "2026-03-18",       // Check-out date
  "nights": 3,                     // Calculated nights
  "room_type": "Deluxe Suite",
  "room_number": "405",
  "board_type": "BB",
  "rate_plan": "Best Available",
  "total_value": 450.00,
  "currency": "EUR",
  "adults": 2,
  "children": 0,
  "notes": "Late checkout requested",
  "created_at": "2024-03-01T10:00:00Z",
  "updated_at": "2024-03-01T10:00:00Z"
}

Guest Stage Lifecycle

Automatic stage tracking based on reservation dates

unknown

No booking data

pre_stay

Before check-in

during_stay

At hotel

post_stay

After checkout

Guest stages are automatically updated by a daily cron job and when booking events are received. The AI assistant uses the guest stage to personalize conversations.

B2B CRM

Scopes & Module Gating

b2b:read

Required for GET endpoints

b2b:write

Required for POST / PATCH endpoints

All /api/v1/b2b/* endpoints require the B2B CRM module to be enabled for your tenant. Requests without it return 403 MODULE_NOT_ENABLED. Contact your account manager to activate the module.

POST

/api/v1/b2b/accounts

Create a new B2B account or update an existing one. Upsert resolution order: external_id → tax_id → iata_code → insert new.

Required Scope

b2b:write

Request Body

Parameter	Type	Required	Description
`legal_name`	string	Required	Legal company name (max 200 chars)
`trade_name`	string	Optional	Commercial / brand name
`tax_id`	string	Optional	CIF/NIF or international Tax ID. Unique per tenant (case-insensitive) — used for upsert matching and parent_account references
`iata_code`	string	Optional	IATA agency code — also a matching identifier for reservation attribution
`sector`	string	Optional	Industry sector (free text)
`profile`	string	Optional	corporate or mice (default: corporate). Drives which deal flow and account blocks apply
`account_type`	string	Optional	travel_agency, tour_operator, dmc, incentive_agency, corporate_booking, corporate, event_organizer, other
`source`	string	Optional	Where the account came from (free text)
`website`	string	Optional	Company website URL
`email_domains`	string[]	Optional	Up to 20 domains (e.g. @acme.com). Reservation holder emails on these domains generate attribution suggestions
`billing_address`	object	Optional	Fiscal address (see Billing Address Object below)
`billing_details`	object	Optional	Key-value string map (e.g. invoice_email, VAT notes)
`parent_account`	object	Optional	Reference to an existing parent account (see Account Reference Object below). Must resolve (422 PARENT_NOT_FOUND); hierarchy max 3 levels (422 HIERARCHY_TOO_DEEP)
`status`	string	Optional	prospect, active, inactive (default: active)
`promo_codes`	string[]	Optional	Up to 50 promo/rate codes (e.g. CORP_ACME2026). Matched against reservation rate codes for attribution
`commitment_room_nights`	number	Optional	Annual contracted room-night commitment
`contract_start_date`	string	Optional	Contract start (YYYY-MM-DD)
`contract_end_date`	string	Optional	Contract end (YYYY-MM-DD) — drives renewal alerts
`payment_method`	string	Optional	credit or direct
`credit_limit`	number	Optional	Credit limit amount
`payment_days`	number	Optional	Payment terms in days (0–365)
`cancellation_policy`	string	Optional	Agreed cancellation policy (max 2000 chars)
`commission_rate`	number	Optional	Commission percentage on lodging (0–100). Child accounts inherit from the parent when unset
`commission_settlement`	string	Optional	deducted_invoice or post_checkout
`external_id`	string	Optional	Your PMS/CRM identifier. Unique per tenant — the primary upsert key when provided
`channel_manager_code`	string	Optional	Channel manager agency code (matching identifier)
`crs_code`	string	Optional	CRS agency code (matching identifier)
`mirai_agency_id`	string	Optional	Mirai Pro agency id (matching identifier)
`custom_fields`	object	Optional	Free-form key-value pairs

Billing Address Object

Parameter	Type	Required	Description
`line1`	string	Optional	Address line 1
`line2`	string	Optional	Address line 2
`city`	string	Optional	City
`region`	string	Optional	Region / state / province
`postal_code`	string	Optional	Postal code
`country`	string	Optional	ISO 3166-1 alpha-2 uppercase (e.g. ES, US)

Account Reference Object

Used by parent_account here, by account on deals, and by b2b_account on guest ingest. At least one identifier is required. Resolution order: id → external_id → tax_id → iata_code.

Parameter	Type	Required	Description
`id`	string	Optional	GuestMaker account UUID
`external_id`	string	Optional	Your PMS/CRM identifier
`tax_id`	string	Optional	Tax ID (case-insensitive match)
`iata_code`	string	Optional	IATA agency code

Example Request

curl -X POST https://guestmaker.ai/api/v1/b2b/accounts \
  -H "Authorization: Bearer gmkr_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "legal_name": "Viajes Mediterraneo S.L.",
    "trade_name": "Viajes Mediterraneo",
    "tax_id": "B12345678",
    "iata_code": "78212345",
    "profile": "corporate",
    "account_type": "travel_agency",
    "email_domains": ["@viajesmediterraneo.com"],
    "billing_address": {
      "line1": "Calle Gran Via 28",
      "city": "Madrid",
      "postal_code": "28013",
      "country": "ES"
    },
    "commission_rate": 10,
    "commission_settlement": "post_checkout",
    "payment_method": "credit",
    "credit_limit": 50000,
    "payment_days": 30,
    "promo_codes": ["AGMED2026"],
    "commitment_room_nights": 1500,
    "contract_start_date": "2026-01-01",
    "contract_end_date": "2026-12-31",
    "parent_account": { "tax_id": "B87654321" },
    "external_id": "PMS-AG-0042"
  }'

Response

201 when a new account was created, 200 when an existing one was updated.

{
  "success": true,
  "data": {
    "account_id": "550e8400-e29b-41d4-a716-446655440000",
    "is_new": true,
    "message": "Account created successfully"
  }
}

GET

/api/v1/b2b/accounts

List B2B accounts, ordered by most recently updated. Supports incremental sync via updated_since.

PATCH

/api/v1/b2b/accounts/{id}

Partially update an account by UUID — only the fields you send are written. A GET on the same path returns the full account.

POST

/api/v1/b2b/accounts/batch

Create or update up to 500 accounts in a single request. Partial success model — each account is processed independently.

POST

/api/v1/b2b/deals

Create a deal (opportunity) for an existing account. The deal lands in the default pipeline of its flow type, in the first qualification stage.

POST

/api/v1/guests

B2B contacts: the existing guest endpoint accepts contact_type and a b2b_account link — no separate contacts endpoint needed.

Identification & Attribution

How reservations are automatically linked to B2B accounts for production reporting

Every reservation you ingest is matched against your accounts' identifiers in strict priority order. The first match wins; manual links made in the dashboard are never overwritten.

Agency code

The reservation's agency/channel code matches an account's iata_code, channel_manager_code, crs_code or external_id — auto-linked.

Promo / rate code

The stay's rate code matches one of the account's promo_codes (or an open corporate deal's promo code) — auto-linked.

Mirai agency ID

The booking source's Mirai agency identifier matches mirai_agency_id — auto-linked.

Email domain (suggestion only)

The reservation holder's email domain appears in an account's email_domains — surfaced as a suggestion for a human to confirm, never auto-linked.

The more identifiers you send on your accounts (IATA, channel manager codes, promo codes, email domains), the higher your automatic attribution coverage.

B2B Error Codes

400 Bad Request

Invalid request body or query parameters

VALIDATION_ERROR

401 Unauthorized

Invalid or missing API key

UNAUTHORIZED

403 Forbidden

The B2B CRM module is not enabled for this tenant (also FORBIDDEN when the key lacks the b2b scope)

MODULE_NOT_ENABLED

404 Not Found

Account id does not exist for this tenant

NOT_FOUND

422 Unprocessable

parent_account reference does not resolve to an existing account

PARENT_NOT_FOUND

422 Unprocessable

Linking the parent would exceed the 3-level account hierarchy

HIERARCHY_TOO_DEEP

422 Unprocessable

Linking the parent would create a cycle in the hierarchy

HIERARCHY_CYCLE

422 Unprocessable

Deals: the account reference does not resolve to an existing account

ACCOUNT_NOT_FOUND

422 Unprocessable

Deals: no pipeline exists for the flow type (module defaults not seeded)

NO_PIPELINE

429 Too Many Requests

Rate limit exceeded

RATE_LIMITED

Error Handling

Error Response Format

{
  "success": false,
  "error": {
    "message": "Validation failed",
    "code": "VALIDATION_ERROR",
    "details": [
      { "field": "phone", "message": "Phone number is required" },
      { "field": "first_name", "message": "First name is required" }
    ]
  }
}

HTTP Status Codes

200 OK

Request successful

201 Created

Resource created successfully

202 Accepted

Request accepted for async processing

400 Bad Request

Invalid request parameters

VALIDATION_ERROR

401 Unauthorized

Invalid or missing API key

UNAUTHORIZED

403 Forbidden

Insufficient permissions/scopes

FORBIDDEN

404 Not Found

Resource not found

NOT_FOUND

409 Conflict

Resource already exists

CONFLICT

422 Unprocessable

Request understood but cannot be processed

UNPROCESSABLE

429 Too Many Requests

Rate limit exceeded

RATE_LIMITED

500 Internal Error

Server error

INTERNAL_ERROR

503 Service Unavailable

Service temporarily unavailable

SERVICE_UNAVAILABLE

Rate Limits

API requests are rate limited per API key. The default limit is 1,000 requests per minute.

Rate Limit Headers

Parameter	Type	Required	Description
`X-RateLimit-Limit`	number	Required	Maximum requests per minute
`X-RateLimit-Remaining`	number	Required	Requests remaining in current window
`X-RateLimit-Reset`	number	Required	Unix timestamp when the limit resets

Rate Limit Response

HTTP/1.1 429 Too Many Requests
X-RateLimit-Limit: 1000
X-RateLimit-Remaining: 0
X-RateLimit-Reset: 1710507600
Retry-After: 45

{
  "success": false,
  "error": {
    "message": "Rate limit exceeded. Please retry after 45 seconds.",
    "code": "RATE_LIMITED"
  }
}

Need higher limits?

Contact us to discuss higher rate limits for your integration. Enterprise plans include custom limits up to 10,000 requests/minute.

Best Practices

Idempotency

Always include an idempotency_key in event requests to prevent duplicate processing if you need to retry a failed request.

Use a unique, deterministic key (e.g., checkin-{booking_id})
Keys are valid for 24 hours
Same key returns the original response without reprocessing

Error Handling

Implement robust error handling for a reliable integration:

Retry 5xx errors with exponential backoff (2s, 4s, 8s, 16s)
Do not retry 4xx errors - fix the request first
Log error responses for debugging
Monitor rate limit headers to avoid hitting limits
Set reasonable timeouts (30s recommended)

Webhook Reliability

Ensure your webhook endpoints are reliable:

Return 200 OK quickly (within 5 seconds)
Process webhooks asynchronously if needed
Always verify the signature before processing
Implement idempotent processing (webhooks may be delivered more than once)
Use the X-Webhook-Delivery header for deduplication

Phone Number Formatting

Always use E.164 format for phone numbers:

Start with + and country code (e.g., +1 for US, +34 for Spain)
No spaces, dashes, or parentheses
URL-encode the + as %2B in query parameters
Example: +34612345678 (Spain)

Testing

Use our sandbox for development and testing:

Use test API keys (gmkr_test_) for sandbox
Test all error scenarios (validation, auth, rate limits)
Use the interactive sandbox at /developers/sandbox
Test webhook signature verification locally

Bulk Ingestion Guide

Recommended patterns for ingesting large volumes of contacts and bookings

Recommended Integration Flow

Register custom field definitions via POST /api/v1/fields (once)
Send guest + booking data via POST /api/v1/guests
Trigger lifecycle events via POST /api/v1/events

Concurrency & Throughput

Send up to 10 concurrent requests for optimal throughput
Default limit: 1,000 req/min (contact us for higher limits)
Monitor X-RateLimit-Remaining to stay within limits
Implement exponential backoff on 429 responses (2s, 4s, 8s, 16s)

Deduplication & Idempotency

Guest endpoint uses phone-based dedup: sending the same phone number updates the existing contact
Set update_if_exists: true (default) for safe upserts
Reservation dedup uses booking_id + hotel_code as the unique key
Event endpoint uses idempotency_key for dedup (24-hour validity)

Performance Tips

Use hotel_code instead of hotel_name for faster hotel lookups
Register custom field definitions before sending guest data
Include custom_fields in the guest request to populate both JSONB storage and the segment builder
Booking data automatically triggers guest stage calculation and journey events

Initial Data Migration

Ready to integrate?

Request API access to get your credentials and start building.