openapi: 3.1.0
info:
  title: Salesforce Service Cloud Salesforce Chat REST Accounts Messages API
  description: REST API for managing live chat sessions between agents and visitors in Salesforce Service Cloud. Enables initiating chat sessions, sending and receiving messages, and monitoring chat activity.
  version: '59.0'
  contact:
    name: Salesforce Developer Support
    url: https://developer.salesforce.com/support
  termsOfService: https://www.salesforce.com/company/legal/agreements/
servers:
- url: https://{hostname}/chat/rest
  description: Chat REST API Endpoint
  variables:
    hostname:
      default: d.la1-c1-ia4.salesforceliveagent.com
      description: Your Live Agent endpoint hostname
security:
- apiKey: []
tags:
- name: Messages
  description: Chat message operations
paths:
  /System/Messages:
    get:
      operationId: getMessages
      summary: Salesforce Service Cloud Get chat messages
      description: Returns all messages sent between agents and chat visitors during a chat session, including system messages and events.
      tags:
      - Messages
      parameters:
      - $ref: '#/components/parameters/SessionKey'
      - $ref: '#/components/parameters/AffinityToken'
      responses:
        '200':
          description: Chat messages
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MessagesResponse'
        '403':
          description: Invalid session
  /Chasitor/ChatMessage:
    post:
      operationId: sendChatMessage
      summary: Salesforce Service Cloud Send a chat message
      description: Sends a chat message from the visitor to the agent during an active chat session.
      tags:
      - Messages
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ChatMessageRequest'
      responses:
        '200':
          description: Message sent successfully
        '403':
          description: Invalid session or chat ended
components:
  parameters:
    SessionKey:
      name: X-LIVEAGENT-SESSION-KEY
      in: header
      required: true
      description: The session key from the SessionId response
      schema:
        type: string
    AffinityToken:
      name: X-LIVEAGENT-AFFINITY
      in: header
      required: true
      description: Affinity token for session routing
      schema:
        type: string
  schemas:
    ChatMessage:
      type: object
      properties:
        type:
          type: string
          description: Type of message
          enum:
          - ChatMessage
          - AgentTyping
          - ChatEnded
          - ChatTransferred
          - AgentNotTyping
          - ChatEstablished
        message:
          type: object
          properties:
            text:
              type: string
              description: Message text content
            name:
              type: string
              description: Sender name
    ChatMessageRequest:
      type: object
      required:
      - text
      properties:
        text:
          type: string
          description: Message text to send
    MessagesResponse:
      type: object
      properties:
        messages:
          type: array
          items:
            $ref: '#/components/schemas/ChatMessage'
          description: Array of chat messages and events
  securitySchemes:
    apiKey:
      type: apiKey
      in: header
      name: X-LIVEAGENT-API-VERSION
      description: Live Agent API version header
externalDocs:
  description: Chat REST API Developer Guide
  url: https://developer.salesforce.com/docs/atlas.en-us.live_agent_rest.meta/live_agent_rest/