Respond.io Messages API

openapi: 3.0.1
info:
  title: Respond.io Developer API
  description: >-
    REST API for the respond.io omnichannel customer-conversation management
    platform. Manage contacts, send and read messages across connected channels,
    open and close conversations, assign users, post internal comments, manage
    tags and custom fields, and configure webhooks. Requests and responses are
    JSON. Contacts are addressed by an identifier of the form `id:{id}`,
    `email:{email}`, or `phone:{phone}`.
  termsOfService: https://respond.io/terms-and-conditions
  contact:
    name: Respond.io Support
    url: https://developers.respond.io/
  version: '2.0'
servers:
  - url: https://api.respond.io/v2
security:
  - bearerAuth: []
tags:
  - name: Contacts
    description: Create, read, update, merge, list, and delete contacts.
  - name: Messages
    description: Send messages to contacts and read message history.
  - name: Conversations
    description: Open, close, status, and assign conversations.
  - name: Comments
    description: Internal collaboration comments on a contact.
  - name: Tags
    description: Workspace tags and contact tag assignment.
  - name: Custom Fields
    description: Structured contact metadata definitions.
paths:
  /contact:
    post:
      operationId: createContact
      tags:
        - Contacts
      summary: Create a contact
      description: Creates a new contact in the workspace.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ContactCreate'
      responses:
        '200':
          description: Contact created.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Contact'
        '429':
          $ref: '#/components/responses/RateLimited'
  /contact/create_or_update/{identifier}:
    post:
      operationId: createOrUpdateContact
      tags:
        - Contacts
      summary: Create or update a contact
      description: >-
        Creates a contact if none matches the identifier, otherwise updates the
        existing contact.
      parameters:
        - $ref: '#/components/parameters/Identifier'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ContactCreate'
      responses:
        '200':
          description: Contact created or updated.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Contact'
        '429':
          $ref: '#/components/responses/RateLimited'
  /contact/list:
    get:
      operationId: listContacts
      tags:
        - Contacts
      summary: List contacts
      description: Returns a paginated list of contacts in the workspace.
      parameters:
        - name: cursorId
          in: query
          description: Cursor id for pagination.
          required: false
          schema:
            type: integer
        - name: limit
          in: query
          description: Number of records to return (max 100).
          required: false
          schema:
            type: integer
            default: 10
      responses:
        '200':
          description: A list of contacts.
          content:
            application/json:
              schema:
                type: object
                properties:
                  items:
                    type: array
                    items:
                      $ref: '#/components/schemas/Contact'
                  pagination:
                    $ref: '#/components/schemas/Pagination'
        '429':
          $ref: '#/components/responses/RateLimited'
  /contact/{identifier}:
    get:
      operationId: getContact
      tags:
        - Contacts
      summary: Get a contact
      description: Retrieves a single contact by identifier.
      parameters:
        - $ref: '#/components/parameters/Identifier'
      responses:
        '200':
          description: The contact.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Contact'
        '404':
          $ref: '#/components/responses/NotFound'
        '429':
          $ref: '#/components/responses/RateLimited'
    put:
      operationId: updateContact
      tags:
        - Contacts
      summary: Update a contact
      description: Updates the fields of an existing contact.
      parameters:
        - $ref: '#/components/parameters/Identifier'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ContactCreate'
      responses:
        '200':
          description: Contact updated.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Contact'
        '404':
          $ref: '#/components/responses/NotFound'
        '429':
          $ref: '#/components/responses/RateLimited'
    delete:
      operationId: deleteContact
      tags:
        - Contacts
      summary: Delete a contact
      description: Permanently deletes a contact from the workspace.
      parameters:
        - $ref: '#/components/parameters/Identifier'
      responses:
        '200':
          description: Contact deleted.
        '404':
          $ref: '#/components/responses/NotFound'
        '429':
          $ref: '#/components/responses/RateLimited'
  /contact/merge:
    post:
      operationId: mergeContacts
      tags:
        - Contacts
      summary: Merge contacts
      description: >-
        Merges a secondary contact into a primary contact, consolidating
        conversations, tags, and fields onto the primary.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
                - primaryContactId
                - secondaryContactId
              properties:
                primaryContactId:
                  type: integer
                  description: Id of the contact to keep.
                secondaryContactId:
                  type: integer
                  description: Id of the contact merged into the primary.
      responses:
        '200':
          description: Contacts merged.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Contact'
        '429':
          $ref: '#/components/responses/RateLimited'
  /contact/{identifier}/tag:
    post:
      operationId: addContactTags
      tags:
        - Tags
      summary: Add tags to a contact
      description: Adds one or more tags to a contact.
      parameters:
        - $ref: '#/components/parameters/Identifier'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: array
              items:
                type: string
              example:
                - vip
                - newsletter
      responses:
        '200':
          description: Tags added.
        '429':
          $ref: '#/components/responses/RateLimited'
    delete:
      operationId: removeContactTags
      tags:
        - Tags
      summary: Remove tags from a contact
      description: Removes one or more tags from a contact.
      parameters:
        - $ref: '#/components/parameters/Identifier'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: array
              items:
                type: string
      responses:
        '200':
          description: Tags removed.
        '429':
          $ref: '#/components/responses/RateLimited'
  /contact/{identifier}/channel:
    get:
      operationId: listContactChannels
      tags:
        - Contacts
      summary: List a contact's channels
      description: Lists the messaging channels a contact is reachable on.
      parameters:
        - $ref: '#/components/parameters/Identifier'
      responses:
        '200':
          description: A list of channels.
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Channel'
        '429':
          $ref: '#/components/responses/RateLimited'
  /contact/{identifier}/message:
    post:
      operationId: sendMessage
      tags:
        - Messages
      summary: Send a message
      description: >-
        Sends a message to a contact through a specific channel. If channelId is
        omitted, the message is sent through the last interacted channel.
      parameters:
        - $ref: '#/components/parameters/Identifier'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/MessageSend'
      responses:
        '200':
          description: Message accepted for delivery.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MessageResult'
        '429':
          $ref: '#/components/responses/RateLimited'
  /contact/{identifier}/message/{messageId}:
    get:
      operationId: getMessage
      tags:
        - Messages
      summary: Get a message
      description: Retrieves a single message from a contact's conversation by message id.
      parameters:
        - $ref: '#/components/parameters/Identifier'
        - name: messageId
          in: path
          required: true
          description: The message identifier.
          schema:
            type: integer
      responses:
        '200':
          description: The message.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Message'
        '404':
          $ref: '#/components/responses/NotFound'
        '429':
          $ref: '#/components/responses/RateLimited'
  /contact/{identifier}/conversation:
    post:
      operationId: updateConversationStatus
      tags:
        - Conversations
      summary: Open or close a conversation
      description: Opens or closes the conversation for a contact.
      parameters:
        - $ref: '#/components/parameters/Identifier'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
                - status
              properties:
                status:
                  type: string
                  enum:
                    - open
                    - close
                closingNoteId:
                  type: integer
                  description: Optional closing note applied when closing.
      responses:
        '200':
          description: Conversation status updated.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Conversation'
        '429':
          $ref: '#/components/responses/RateLimited'
  /contact/{identifier}/conversation/assignee:
    post:
      operationId: assignConversation
      tags:
        - Conversations
      summary: Assign or unassign a conversation
      description: >-
        Assigns a user (human or AI agent) to the contact's conversation, or
        unassigns when assignee is null.
      parameters:
        - $ref: '#/components/parameters/Identifier'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                assignee:
                  type: string
                  nullable: true
                  description: User identifier (email) to assign, or null to unassign.
                  example: email:agent@example.com
      responses:
        '200':
          description: Conversation assignment updated.
        '429':
          $ref: '#/components/responses/RateLimited'
  /contact/{identifier}/comment:
    post:
      operationId: createComment
      tags:
        - Comments
      summary: Create a comment
      description: >-
        Adds an internal comment to a contact's conversation. Comments support
        mentioning users and are not delivered to the contact.
      parameters:
        - $ref: '#/components/parameters/Identifier'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
                - text
              properties:
                text:
                  type: string
                  description: Comment body. Use @[email] to mention a user.
                  example: Following up @[agent@example.com]
      responses:
        '200':
          description: Comment created.
        '429':
          $ref: '#/components/responses/RateLimited'
  /tag:
    post:
      operationId: createTag
      tags:
        - Tags
      summary: Create a tag
      description: Creates a new workspace tag.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/Tag'
      responses:
        '200':
          description: Tag created.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Tag'
        '429':
          $ref: '#/components/responses/RateLimited'
  /tag/{tagId}:
    put:
      operationId: updateTag
      tags:
        - Tags
      summary: Update a tag
      description: Updates an existing workspace tag.
      parameters:
        - name: tagId
          in: path
          required: true
          schema:
            type: integer
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/Tag'
      responses:
        '200':
          description: Tag updated.
        '429':
          $ref: '#/components/responses/RateLimited'
    delete:
      operationId: deleteTag
      tags:
        - Tags
      summary: Delete a tag
      description: Deletes a workspace tag.
      parameters:
        - name: tagId
          in: path
          required: true
          schema:
            type: integer
      responses:
        '200':
          description: Tag deleted.
        '429':
          $ref: '#/components/responses/RateLimited'
  /custom_field:
    get:
      operationId: listCustomFields
      tags:
        - Custom Fields
      summary: List custom fields
      description: Lists all custom field definitions in the workspace.
      responses:
        '200':
          description: A list of custom fields.
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/CustomField'
        '429':
          $ref: '#/components/responses/RateLimited'
    post:
      operationId: createCustomField
      tags:
        - Custom Fields
      summary: Create a custom field
      description: Creates a new custom field definition.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CustomField'
      responses:
        '200':
          description: Custom field created.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CustomField'
        '429':
          $ref: '#/components/responses/RateLimited'
components:
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: >-
        API Access Token from Settings > Integrations > Developer API, sent in
        the Authorization header as `Bearer {token}`.
  parameters:
    Identifier:
      name: identifier
      in: path
      required: true
      description: >-
        Contact identifier in the form id:{id}, email:{email}, or phone:{phone}.
      schema:
        type: string
      example: phone:+60123456789
  responses:
    NotFound:
      description: Resource not found.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    RateLimited:
      description: Too many requests. Limited to 5 requests per second per method.
      headers:
        Retry-After:
          description: Seconds to wait before retrying.
          schema:
            type: integer
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  schemas:
    Contact:
      type: object
      properties:
        id:
          type: integer
          description: System-assigned contact id.
        firstName:
          type: string
        lastName:
          type: string
        email:
          type: string
          format: email
        phone:
          type: string
        language:
          type: string
        profilePic:
          type: string
          format: uri
        countryCode:
          type: string
        status:
          type: string
          description: Lifecycle stage of the contact.
        assignee:
          type: string
          nullable: true
        created:
          type: integer
          description: Unix timestamp when the contact was created.
        tags:
          type: array
          items:
            type: string
        customFields:
          type: array
          items:
            $ref: '#/components/schemas/CustomFieldValue'
    ContactCreate:
      type: object
      properties:
        firstName:
          type: string
        lastName:
          type: string
        email:
          type: string
          format: email
        phone:
          type: string
        language:
          type: string
        profilePic:
          type: string
          format: uri
        countryCode:
          type: string
        customFields:
          type: array
          items:
            $ref: '#/components/schemas/CustomFieldValue'
    CustomFieldValue:
      type: object
      properties:
        name:
          type: string
        value:
          type: string
    CustomField:
      type: object
      properties:
        id:
          type: integer
        name:
          type: string
        type:
          type: string
          enum:
            - text
            - number
            - date
            - list
            - checkbox
            - url
        options:
          type: array
          items:
            type: string
          description: Allowed values when type is list.
    Tag:
      type: object
      properties:
        id:
          type: integer
        name:
          type: string
      required:
        - name
    Channel:
      type: object
      properties:
        id:
          type: integer
        name:
          type: string
        source:
          type: string
          description: Channel source such as whatsapp, messenger, telegram, email, sms.
        meta:
          type: object
          additionalProperties: true
    MessageSend:
      type: object
      required:
        - message
      properties:
        channelId:
          type: integer
          description: Target channel id. Omit to use the last interacted channel.
        message:
          $ref: '#/components/schemas/MessageContent'
    MessageContent:
      type: object
      required:
        - type
      properties:
        type:
          type: string
          enum:
            - text
            - attachment
            - quick_reply
            - whatsapp_template
        text:
          type: string
          description: Body text for type text or quick_reply.
        attachment:
          type: object
          properties:
            type:
              type: string
              enum:
                - image
                - video
                - audio
                - file
            url:
              type: string
              format: uri
        quickReplies:
          type: array
          items:
            type: object
            properties:
              title:
                type: string
              payload:
                type: string
        template:
          type: object
          description: WhatsApp template payload (name, languageCode, components).
          additionalProperties: true
    MessageResult:
      type: object
      properties:
        messageId:
          type: integer
        status:
          type: string
          example: queued
    Message:
      type: object
      properties:
        messageId:
          type: integer
        contactId:
          type: integer
        channelId:
          type: integer
        traffic:
          type: string
          enum:
            - incoming
            - outgoing
        message:
          $ref: '#/components/schemas/MessageContent'
        timestamp:
          type: integer
        status:
          type: string
          description: Delivery status (sent, delivered, read, failed).
    Conversation:
      type: object
      properties:
        contactId:
          type: integer
        status:
          type: string
          enum:
            - open
            - close
        assignee:
          type: string
          nullable: true
        opened:
          type: integer
        closed:
          type: integer
          nullable: true
    Pagination:
      type: object
      properties:
        cursorId:
          type: integer
          nullable: true
        hasMore:
          type: boolean
    Error:
      type: object
      properties:
        message:
          type: string
        status:
          type: integer