openapi: 3.0.3
info:
  title: Silverpop Engage API (Acoustic Campaign) Authentication API
  description: The Silverpop Engage API, now provided as Acoustic Campaign (formerly IBM Watson Campaign Automation), enables digital marketers to manage contact lists, execute email campaigns, send transactional messages, and track engagement through a REST and XML-based interface.
  version: '1.0'
  contact:
    name: Acoustic Developer Support
    url: https://developer.goacoustic.com
  termsOfService: https://www.goacoustic.com/terms-of-use
servers:
- url: https://api-campaign-us-1.goacoustic.com
  description: US Production
- url: https://api-campaign-eu-1.goacoustic.com
  description: EU Production
security:
- BearerAuth: []
tags:
- name: Authentication
  description: OAuth 2.0 token management
paths:
  /oauth/token:
    post:
      operationId: createAccessToken
      summary: Create Access Token
      description: Generate an OAuth 2.0 access token using client credentials (client_id, client_secret, and refresh_token).
      tags:
      - Authentication
      security: []
      requestBody:
        required: true
        content:
          application/x-www-form-urlencoded:
            schema:
              type: object
              required:
              - grant_type
              - client_id
              - client_secret
              - refresh_token
              properties:
                grant_type:
                  type: string
                  enum:
                  - refresh_token
                client_id:
                  type: string
                client_secret:
                  type: string
                refresh_token:
                  type: string
      responses:
        '200':
          description: Access token issued
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/AccessToken'
        '401':
          description: Invalid credentials
components:
  schemas:
    AccessToken:
      type: object
      properties:
        access_token:
          type: string
        token_type:
          type: string
          example: bearer
        expires_in:
          type: integer
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      description: OAuth 2.0 access token. Obtain via POST /oauth/token.
externalDocs:
  description: Acoustic Campaign API Documentation
  url: https://developer.goacoustic.com/acoustic-campaign/reference/overview