Booking Holdings Messages API

openapi: 3.1.0
info:
  title: Booking.com Demand Accommodations Messages API
  version: '3.1'
  summary: "The Booking.com Demand API enables Affiliate Partners to access Booking.com's travel inventory, including accommodations, car rentals, and flights. \n\nUse Demand API to search, retrieve details, check availability, manage bookings and run reports using orders details.\n\n- RESTful API with JSON responses.\n- Make HTTPS POST requests to interact with endpoints.\n- Requires authentication using your Affiliate ID and token credentials.\n\n[Check the try out guide!](/demand/docs/getting-started/try-out-the-api)\n"
  x-last-validated: '2026-06-02'
  x-generated-from: documentation
  description: This API collection is specific for the stay part of the connected trip. </br></br>Use these endpoints to search for stays such as hotels and apartments, check availability, retrieve reviews, and get detailed property information.
servers:
- url: https://demandapi.booking.com/3.1
  description: Production environment
- url: https://demandapi-sandbox.booking.com/3.1
  description: Sandbox environment
security:
- BearerAuth: []
tags:
- name: Messages
  x-displayName: Messages
  description: Provides endpoints for two-way post-booking communication between guests and properties. </br></br>Use these endpoints to send and retrieve messages, exchange images, and check conversation details.
paths:
  /messages/send:
    post:
      summary: Booking.com Send a Message
      description: 'Sends a message within a conversation. The message body supports plain text.

        Optionally, attach a file by referencing a previously uploaded attachment ID.

        '
      operationId: messagesSend
      tags:
      - Messages
      parameters:
      - $ref: '#/components/parameters/AffiliateIdHeader'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              title: SendMessageRequest
              type: object
              required:
              - conversation
              - content
              - accommodation
              properties:
                conversation:
                  type: string
                  description: Unique identifier of the conversation.
                accommodation:
                  type: string
                  description: Unique identifier of the property.
                content:
                  type: string
                  description: The message text to send.
                attachments:
                  type: array
                  items:
                    type: string
                  description: Optional list of attachment IDs, if sending one or more files.
            example:
              conversation: 8586a789-44f4-5521-9f27-f5efd097cba6
              accommodation: '6819547'
              content: Hello, I'm your guest!.
              attachments:
              - c325f460-1dc6-11f0-80f0-8d0908786f77
      responses:
        '200':
          description: Message sent successfully.
          content:
            application/json:
              schema:
                type: object
                properties:
                  request_id:
                    type: string
                    description: Unique identifier for this request. Provide this ID when contacting support.
                  data:
                    type: object
                    properties:
                      message:
                        type: string
                        description: Unique identifier for the sent message.
              example:
                request_id: cdb0b154-2eae-481b-8fee-fb2725296e1f
                data:
                  message: 3164e570-19e0-11f0-baca-e5019c8df435
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
  /messages/latest:
    post:
      summary: Booking.com Fetch Latest Messages
      description: 'Retrieves up to **100 of the most recent messages** including messages from both property and guest.<br/>


        - Messages are returned in reverse chronological order (newest first).

        - Use this endpoint to sync message threads or poll for updates.


        **Important:**  To retrieve the latest messages, send an empty POST request.  Any content in the request body will be ignored.

        '
      operationId: messagesLatest
      tags:
      - Messages
      parameters:
      - $ref: '#/components/parameters/AffiliateIdHeader'
      responses:
        '200':
          description: Latest messages fetched successfully.
          content:
            application/json:
              schema:
                type: object
                properties:
                  request_id:
                    type: string
                    description: Unique identifier for this request. Provide this ID when contacting support.
                  data:
                    type: object
                    properties:
                      messages:
                        type: array
                        items:
                          type: object
                          properties:
                            message_id:
                              type: string
                              description: Unique identifier of the message.
                            reply_to:
                              type:
                              - string
                              - 'null'
                              description: ID of the message this is replying to (if applicable).
                            conversation:
                              type: object
                              properties:
                                id:
                                  type: string
                                  description: Unique identifier of the conversation.
                                accommodation:
                                  type: string
                                  description: Unique identifier of the property.
                                reservation:
                                  type: string
                                  description: Unique identifier of the reservation.
                            content:
                              type: string
                              description: Message text content.
                            sender:
                              type: object
                              properties:
                                participant_id:
                                  type: string
                                  description: Unique identifier of the conversation participant.
                                metadata:
                                  type: object
                                  description: Additional metadata about the sender.
                            attachments:
                              type: array
                              items:
                                type: string
                                description: Attachment IDs included with the message.
                            timestamp:
                              type: string
                              format: date-time
                              description: Timestamp in ISO 8601 format (UTC) when the message was sent.
              example:
                request_id: 0248d85a-17e0-44b3-a37c-7d4b5c03f58b
                data:
                  messages:
                  - message_id: daca26da-4ce3-519d-b9eb-623eeb674800
                    reply_to: null
                    conversation:
                      id: b2364f9b-6466-599a-a947-0d35cff4f492
                      accommodation: '5589515'
                      reservation: '4439608993'
                    content: Hello Anne, welcome to CS Training Test Hotel...
                    sender:
                      participant_id: 930d9af8-2390-5e43-a4d7-235b52a30a14
                      metadata:
                        type: property
                        name: CS Training Test Hotel Sloterdijk 10
                    attachments: []
                    timestamp: '2025-05-08T08:49:15.000Z'
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
  /messages/latest/confirm:
    post:
      summary: Booking.com Confirm Message Receipt
      description: 'Confirms receipt of specified messages.

        This confirmation is required before receiving new messages from the POST /messages/latest endpoint.

        '
      operationId: messagesLatestConfirm
      tags:
      - Messages
      parameters:
      - $ref: '#/components/parameters/AffiliateIdHeader'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              title: ConfirmMessageReceiptRequest
              type: object
              properties:
                messages:
                  type: array
                  items:
                    type: string
                    description: Unique identifier of a message to confirm receipt of.
              example: &id001
                messages:
                - 8586a789-44f4-5521-9f27-f5efd097cba
            examples:
              MessagesLatestConfirmRequestExample:
                summary: Default messagesLatestConfirm request
                x-microcks-default: true
                value: *id001
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
components:
  parameters:
    AffiliateIdHeader:
      in: header
      name: X-Affiliate-Id
      schema:
        type: integer
      required: true
      description: Include here your Affiliate identifier number
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      bearerFormat: string
x-tagGroups:
- name: Travel services
  tags:
  - Accommodations
  - Cars
- name: Common
  tags:
  - Common/locations
  - Common/payments
  - Common/languages
- name: Orders
  tags:
  - Orders
- name: Messaging
  tags:
  - Messages
  - Conversations
  - Attachments