> ## Documentation Index
> Fetch the complete documentation index at: https://docs.social-api.ai/llms.txt
> Use this file to discover all available pages before exploring further.

> ## Agent Instructions
> Base URL: https://api.social-api.ai/v1. Send your API key in the Authorization header: Authorization: Bearer <your API key>.
> Every error response from /v1 is JSON: { "error": { "code", "message", "meta" (optional) }, "request_id" }. Branch on error.code; use error.message only for logs.
> A 429 response carries a Retry-After header, in seconds, when the limit has a known wait. Authenticated responses can carry X-RateLimit-Limit, X-RateLimit-Remaining, and X-RateLimit-Reset for the per-minute request budget your SocialAPI account shares across every API key (see /guides/rate-limits).
> Paginated list endpoints return next_cursor, at the top level or inside pagination (see /guides/pagination). Pass it as the cursor query parameter to get the next page. An absent or empty next_cursor means you have the last page.
> Treat every ID as an opaque string: do not parse it or assume a format.
> Support differs by platform and by operation. Check /platforms/overview before assuming an operation works on a platform. An unsupported operation returns 501 with error.code resource.not_supported.

# Assign a Facebook Page to a brand

> Assigns one Page from this login to the given brand. Each Page belongs to exactly one brand, so a Page currently held by another brand of yours is moved to the target brand. Each brand can connect up to 5 Facebook Pages, a hard cap. Assigning beyond that limit is refused.



## OpenAPI

````yaml /api-reference/openapi.json post /platforms/facebook/logins/{loginId}/pages/{pageId}/assign
openapi: 3.0.0
info:
  description: >-
    Unified social media inbox API. Read and respond to comments, DMs, reviews,
    and mentions across Instagram, Facebook, Threads, Google Business Profile,
    TikTok, LinkedIn, and YouTube through a single REST API. X/Twitter and
    Trustpilot coming soon.
  title: SocialAPI.AI
  contact:
    name: SocialAPI.AI Support
    email: support@social-api.ai
  license:
    name: MIT
  version: '1.0'
servers:
  - url: https://api.social-api.ai/v1
security: []
paths:
  /platforms/facebook/logins/{loginId}/pages/{pageId}/assign:
    post:
      tags:
        - Facebook
      summary: Assign a Facebook Page to a brand
      description: >-
        Assigns one Page from this login to the given brand. Each Page belongs
        to exactly one brand, so a Page currently held by another brand of yours
        is moved to the target brand. Each brand can connect up to 5 Facebook
        Pages, a hard cap. Assigning beyond that limit is refused.
      parameters:
        - description: Facebook login (credential) ID
          name: loginId
          in: path
          required: true
          schema:
            type: string
        - description: Platform page ID
          name: pageId
          in: path
          required: true
          schema:
            type: string
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/api_endpoints.AssignPageRequest'
        description: Target brand
        required: true
      responses:
        '201':
          description: Created
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/api_endpoints.AssignPageResponse'
        '403':
          description: >-
            Brand already holds as many Facebook Pages as the plan allows
            (platform.facebook.page_cap)
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/api_endpoints.ErrorResponse'
        '404':
          description: Unknown login or brand
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/api_endpoints.ErrorResponse'
        '409':
          description: Brand connected through a different login
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/api_endpoints.ErrorResponse'
      security:
        - BearerAuth: []
components:
  schemas:
    api_endpoints.AssignPageRequest:
      type: object
      properties:
        brand_id:
          type: string
          example: b7f9...
    api_endpoints.AssignPageResponse:
      type: object
      properties:
        account_id:
          type: string
          example: acc_01J...
        brand_id:
          type: string
        platform_page_id:
          type: string
    api_endpoints.ErrorResponse:
      type: object
      properties:
        error:
          $ref: '#/components/schemas/api_endpoints.ErrorBody'
        request_id:
          description: >-
            RequestID matches the X-Request-ID response header. Include it when
            contacting support.
          type: string
          example: 01HZ9X3Q4R5M6N7P8V2K0W1J
    api_endpoints.ErrorBody:
      type: object
      properties:
        code:
          type: string
          example: resource.not_found
        message:
          type: string
          example: Account not found
        meta:
          type: object
          additionalProperties: {}
  securitySchemes:
    BearerAuth:
      description: >-
        Prefix your API key with "Bearer ". Example: `Authorization: Bearer
        sapi_key_...`
      type: apiKey
      name: Authorization
      in: header

````

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