openapi: 3.1.0
info:
  title: Sendbird Platform Channels Messages API
  description: The Sendbird Platform API provides server-side access to manage users, channels, messages, and moderation for in-app chat applications built on Sendbird. Supports group channels, open channels, direct messages, push notifications, and webhooks for real-time communication features.
  version: 3.0.0
  termsOfService: https://sendbird.com/terms-of-service/
  contact:
    name: Sendbird Support
    url: https://sendbird.com/contact-us/
  license:
    name: Proprietary
    url: https://sendbird.com/terms-of-service/
servers:
- url: https://api-{application_id}.sendbird.com/v3
  description: Sendbird Platform API (replace {application_id} with your app ID)
  variables:
    application_id:
      default: YOUR_APP_ID
      description: Your Sendbird application ID
security:
- apiTokenAuth: []
tags:
- name: Messages
  description: Operations for sending and managing messages.
paths:
  /group_channels/{channel_url}/messages:
    get:
      operationId: listMessages
      summary: List Messages
      description: Retrieves messages from a specific group channel.
      tags:
      - Messages
      parameters:
      - $ref: '#/components/parameters/channel_url'
      - name: message_ts
        in: query
        description: Unix timestamp to fetch messages around.
        schema:
          type: integer
      - name: prev_limit
        in: query
        description: Number of messages to retrieve before message_ts.
        schema:
          type: integer
          default: 15
          maximum: 200
      - name: next_limit
        in: query
        description: Number of messages to retrieve after message_ts.
        schema:
          type: integer
          default: 0
          maximum: 200
      - name: include
        in: query
        description: Whether to include the message at message_ts.
        schema:
          type: boolean
          default: false
      responses:
        '200':
          description: A list of messages.
          content:
            application/json:
              schema:
                type: object
                properties:
                  messages:
                    type: array
                    items:
                      $ref: '#/components/schemas/Message'
        '400':
          $ref: '#/components/responses/BadRequest'
        '404':
          $ref: '#/components/responses/NotFound'
    post:
      operationId: sendMessage
      summary: Send a Message
      description: Sends a message to a specific group channel.
      tags:
      - Messages
      parameters:
      - $ref: '#/components/parameters/channel_url'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - message_type
              - user_id
              properties:
                message_type:
                  type: string
                  description: Type of message.
                  enum:
                  - MESG
                  - FILE
                  - ADMM
                user_id:
                  type: string
                  description: ID of the user sending the message.
                message:
                  type: string
                  description: Text content of the message.
                data:
                  type: string
                  description: Custom data string.
                custom_type:
                  type: string
                  description: Custom type for message categorization.
                mention_type:
                  type: string
                  enum:
                  - users
                  - channel
                  description: Type of mention.
                mentioned_user_ids:
                  type: array
                  items:
                    type: string
                  description: IDs of mentioned users.
      responses:
        '200':
          description: Message sent successfully.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Message'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  schemas:
    User:
      type: object
      properties:
        user_id:
          type: string
          description: Unique identifier of the user.
        nickname:
          type: string
          description: Display nickname.
        profile_url:
          type: string
          description: Profile image URL.
        is_online:
          type: boolean
          description: Whether the user is currently online.
        is_active:
          type: boolean
          description: Whether the user account is active.
        last_seen_at:
          type: integer
          description: Unix timestamp of last activity.
        access_token:
          type: string
          description: Access token for the user (returned when issue_access_token is true).
        metadata:
          type: object
          description: Custom metadata.
          additionalProperties:
            type: string
        created_at:
          type: integer
          description: Unix timestamp when the user was created.
    Error:
      type: object
      properties:
        error:
          type: boolean
          description: Indicates an error occurred.
        code:
          type: integer
          description: Sendbird error code.
        message:
          type: string
          description: Human-readable error message.
    Message:
      type: object
      properties:
        message_id:
          type: integer
          description: Unique ID of the message.
        type:
          type: string
          description: Message type.
          enum:
          - MESG
          - FILE
          - ADMM
        message:
          type: string
          description: Text content of the message.
        user:
          $ref: '#/components/schemas/User'
        channel_url:
          type: string
          description: URL of the channel containing this message.
        created_at:
          type: integer
          description: Unix timestamp when the message was created.
        updated_at:
          type: integer
          description: Unix timestamp when the message was last updated.
        custom_type:
          type: string
          description: Custom type for message categorization.
        data:
          type: string
          description: Custom data string.
        mention_type:
          type: string
          description: Mention type.
        mentioned_users:
          type: array
          items:
            $ref: '#/components/schemas/User'
          description: Mentioned users.
  parameters:
    channel_url:
      name: channel_url
      in: path
      required: true
      description: URL of the channel.
      schema:
        type: string
  responses:
    NotFound:
      description: Not found. The requested resource does not exist.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    Unauthorized:
      description: Unauthorized. API token is missing or invalid.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    BadRequest:
      description: Bad request.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  securitySchemes:
    apiTokenAuth:
      type: apiKey
      in: header
      name: Api-Token
      description: Sendbird API token obtained from the Sendbird Dashboard.