> ## 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.

# Register a phone number with WhatsApp Business

> Registers a previously verified phone number with WhatsApp Business and sets the 6-digit two-step verification PIN. The phone number must be verified via verify-code first. The PIN must be retained by the caller: losing it triggers a mandatory 7-day wait before it can be reset.



## OpenAPI

````yaml /api-reference/openapi.json post /platforms/whatsapp/phone-numbers/{id}/register
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/whatsapp/phone-numbers/{id}/register:
    post:
      tags:
        - WhatsApp
      summary: Register a phone number with WhatsApp Business
      description: >-
        Registers a previously verified phone number with WhatsApp Business and
        sets the 6-digit two-step verification PIN. The phone number must be
        verified via verify-code first. The PIN must be retained by the caller:
        losing it triggers a mandatory 7-day wait before it can be reset.
      parameters:
        - example: acc_01HZ9X3Q4R5M6N7P8V2K0W1J
          description: Connected account ID (sapi_acc_...)
          name: id
          in: path
          required: true
          schema:
            type: string
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/api_endpoints.WhatsAppRegisterRequest'
        description: 6-digit two-step verification PIN
        required: true
      responses:
        '204':
          description: Phone number registered
        '400':
          description: Missing or invalid PIN
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/api_endpoints.ErrorResponse'
        '401':
          description: Invalid or missing API key
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/api_endpoints.ErrorResponse'
        '404':
          description: Account not found or not owned by caller
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/api_endpoints.ErrorResponse'
        '409':
          description: Phone number not verified or already registered with another BSP
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/api_endpoints.ErrorResponse'
        '502':
          description: WhatsApp/Meta upstream error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/api_endpoints.ErrorResponse'
      security:
        - BearerAuth: []
components:
  schemas:
    api_endpoints.WhatsAppRegisterRequest:
      type: object
      properties:
        pin:
          description: >-
            PIN is the 6-digit two-step verification PIN to set on the phone
            number.

            This PIN is required for future re-registration and must be stored
            securely.
          type: string
          example: '123456'
    api_endpoints.ErrorResponse:
      type: object
      properties:
        error:
          $ref: '#/components/schemas/api_endpoints.ErrorBody'
    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

````