openapi: 3.1.0
info:
  title: Facebook Business Manager Facebook Marketing Ad Accounts Custom Audiences API
  description: Create and manage ad campaigns, analyze performance, and automate advertising workflows across Meta platforms. The Marketing API provides programmatic access to Facebook's advertising system, enabling businesses to create campaigns, ad sets, and ads, manage budgets and bidding strategies, define targeting audiences, and retrieve performance metrics.
  version: '25.0'
  contact:
    name: Meta Developer Support
    url: https://developers.facebook.com/support
  termsOfService: https://developers.facebook.com/terms
servers:
- url: https://graph.facebook.com/v25.0
  description: Facebook Graph API Production Server
security:
- bearerAuth: []
tags:
- name: Custom Audiences
  description: Create and manage custom audiences for ad targeting based on customer data, website visitors, or app users.
paths:
  /act_{ad_account_id}/customaudiences:
    get:
      operationId: listCustomAudiences
      summary: Facebook Business Manager List custom audiences
      description: Retrieves all custom audiences for the specified ad account. Returns audience configurations and approximate sizes.
      tags:
      - Custom Audiences
      parameters:
      - $ref: '#/components/parameters/adAccountId'
      - $ref: '#/components/parameters/fields'
      - $ref: '#/components/parameters/limit'
      - $ref: '#/components/parameters/after'
      responses:
        '200':
          description: Successfully retrieved list of custom audiences
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CustomAudienceList'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
    post:
      operationId: createCustomAudience
      summary: Facebook Business Manager Create a custom audience
      description: Creates a new custom audience for ad targeting. Supports customer file audiences, website custom audiences, app activity audiences, and lookalike audiences.
      tags:
      - Custom Audiences
      parameters:
      - $ref: '#/components/parameters/adAccountId'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CustomAudienceCreate'
      responses:
        '200':
          description: Custom audience created successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CreateResponse'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  schemas:
    CustomAudience:
      type: object
      properties:
        id:
          type: string
          description: The ID of the custom audience
        name:
          type: string
          description: The name of the custom audience
        description:
          type: string
          description: Description of the audience
        subtype:
          type: string
          description: The subtype of the custom audience
          enum:
          - CUSTOM
          - WEBSITE
          - APP
          - OFFLINE_CONVERSION
          - CLAIM
          - PARTNER
          - MANAGED
          - VIDEO
          - LOOKALIKE
          - ENGAGEMENT
        approximate_count:
          type: integer
          description: Approximate number of people in the audience
        data_source:
          type: object
          properties:
            type:
              type: string
            sub_type:
              type: string
          description: The source of the audience data
        delivery_status:
          type: object
          properties:
            status:
              type: integer
              description: Delivery status code
        operation_status:
          type: object
          properties:
            status:
              type: integer
              description: Operation status code
        time_created:
          type: string
          format: date-time
        time_updated:
          type: string
          format: date-time
    PagingCursors:
      type: object
      properties:
        before:
          type: string
          description: Cursor pointing to the start of the current page
        after:
          type: string
          description: Cursor pointing to the end of the current page
    CustomAudienceList:
      type: object
      properties:
        data:
          type: array
          items:
            $ref: '#/components/schemas/CustomAudience'
        paging:
          $ref: '#/components/schemas/Paging'
    Error:
      type: object
      properties:
        error:
          type: object
          properties:
            message:
              type: string
              description: Human-readable error message
            type:
              type: string
              description: Error type classification
            code:
              type: integer
              description: Numeric error code
            error_subcode:
              type: integer
              description: Numeric error subcode for more specific categorization
            fbtrace_id:
              type: string
              description: Unique trace ID for debugging with Facebook support
    Paging:
      type: object
      properties:
        cursors:
          $ref: '#/components/schemas/PagingCursors'
        next:
          type: string
          description: URL for the next page of results
        previous:
          type: string
          description: URL for the previous page of results
    CustomAudienceCreate:
      type: object
      required:
      - name
      - subtype
      properties:
        name:
          type: string
        description:
          type: string
        subtype:
          type: string
          enum:
          - CUSTOM
          - WEBSITE
          - APP
          - OFFLINE_CONVERSION
          - LOOKALIKE
          - ENGAGEMENT
        customer_file_source:
          type: string
          description: Source of customer data for CUSTOM subtype
        lookalike_spec:
          type: object
          description: Specification for lookalike audiences
          properties:
            origin_audience_id:
              type: string
            ratio:
              type: number
              minimum: 0.01
              maximum: 0.2
            country:
              type: string
        rule:
          type: object
          description: Rule-based audience definition for WEBSITE or APP subtypes
    CreateResponse:
      type: object
      properties:
        id:
          type: string
          description: The ID of the newly created object
  parameters:
    adAccountId:
      name: ad_account_id
      in: path
      required: true
      description: The ID of the ad account (numeric, without the act_ prefix)
      schema:
        type: string
    after:
      name: after
      in: query
      required: false
      description: Cursor for pagination to retrieve the next page of results
      schema:
        type: string
    fields:
      name: fields
      in: query
      required: false
      description: Comma-separated list of fields to include in the response. If omitted, default fields are returned.
      schema:
        type: string
    limit:
      name: limit
      in: query
      required: false
      description: Maximum number of objects to return per page. Default is 25.
      schema:
        type: integer
        default: 25
        maximum: 100
  responses:
    BadRequest:
      description: Invalid request parameters or malformed request body
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    Unauthorized:
      description: Invalid or expired access token
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: OAuth 2.0 access token with ads_management or ads_read permissions. Obtain tokens via the Facebook Login flow.
externalDocs:
  description: Facebook Marketing API Documentation
  url: https://developers.facebook.com/docs/marketing-api