Sequin Stream Pull API

openapi: 3.2.0
info:
  title: Sequin Management Backfills Stream Pull API
  description: The Sequin Management API configures and operates a Sequin Postgres change data capture (CDC) deployment programmatically. Sequin is open source and self-hostable, and also runs as Sequin Cloud. Most resources can be defined declaratively in a sequin.yaml file; this API exposes the same resources - Postgres database connections (sources), sink consumers (destinations), HTTP endpoints, and backfills - over REST. The Sequin Stream sink also exposes an HTTP pull consumption surface (receive / ack / nack). All requests require a Bearer token found in the Sequin console under "Manage account". Not all Sequin resources are available in the Management API.
  version: '1.0'
  contact:
    name: Sequin
    url: https://sequinstream.com
  license:
    name: MIT
    url: https://github.com/sequinstream/sequin/blob/main/LICENSE
servers:
- url: https://api.sequinstream.com/api
  description: Sequin Cloud
- url: http://localhost:7376/api
  description: Local development (self-hosted)
security:
- bearerAuth: []
tags:
- name: Stream Pull
  description: HTTP pull consumption for the Sequin Stream sink.
paths:
  /http_pull_consumers/{consumer_name}/receive:
    parameters:
    - name: consumer_name
      in: path
      required: true
      description: The name of the Sequin Stream sink / consumer group.
      schema:
        type: string
    get:
      operationId: receiveMessages
      tags:
      - Stream Pull
      summary: Receive messages
      description: Retrieves a batch of available messages from a Sequin Stream consumer group. Each message carries an ack_id used to later acknowledge or negatively acknowledge it.
      parameters:
      - name: batch_size
        in: query
        required: false
        description: Maximum number of messages to return.
        schema:
          type: integer
          default: 1
      responses:
        '200':
          description: A batch of messages.
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: array
                    items:
                      $ref: '#/components/schemas/StreamMessage'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /http_pull_consumers/{consumer_name}/ack:
    parameters:
    - name: consumer_name
      in: path
      required: true
      description: The name of the Sequin Stream sink / consumer group.
      schema:
        type: string
    post:
      operationId: ackMessages
      tags:
      - Stream Pull
      summary: Acknowledge messages
      description: Acknowledges messages by ack_id so the consumer group will not deliver them again.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/AckRequest'
      responses:
        '200':
          description: Acknowledgement result.
          content:
            application/json:
              schema:
                type: object
                properties:
                  success:
                    type: boolean
        '401':
          $ref: '#/components/responses/Unauthorized'
  /http_pull_consumers/{consumer_name}/nack:
    parameters:
    - name: consumer_name
      in: path
      required: true
      description: The name of the Sequin Stream sink / consumer group.
      schema:
        type: string
    post:
      operationId: nackMessages
      tags:
      - Stream Pull
      summary: Negatively acknowledge messages
      description: Negatively acknowledges messages by ack_id so they become available for redelivery immediately.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/AckRequest'
      responses:
        '200':
          description: Nack result.
          content:
            application/json:
              schema:
                type: object
                properties:
                  success:
                    type: boolean
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  schemas:
    Error:
      type: object
      properties:
        error:
          type: object
          properties:
            code:
              type: string
            message:
              type: string
            details:
              type: object
              additionalProperties: true
    StreamMessage:
      type: object
      properties:
        ack_id:
          type: string
        action:
          type: string
          enum:
          - insert
          - update
          - delete
          - read
        record:
          type: object
          additionalProperties: true
        changes:
          type: object
          additionalProperties: true
        metadata:
          type: object
          additionalProperties: true
    AckRequest:
      type: object
      required:
      - ack_ids
      properties:
        ack_ids:
          type: array
          items:
            type: string
  responses:
    Unauthorized:
      description: Missing or invalid Bearer token.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: 'Bearer token found in the Sequin console under "Manage account". Passed as `Authorization: Bearer YOUR_API_TOKEN`.'