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

# Claim an exact-recipient advertiser invitation

> Claim a one-time invitation as the directly authenticated WorkOS user whose verified email exactly matches the recipient. Claiming does not approve Seller admission or grant account access.



## OpenAPI

````yaml /v2/buyer-api-v2.yaml post /advertiser-invitations/claim
openapi: 3.0.0
info:
  title: Scope3 Buyer API
  version: 2.0.0
  description: |-
    REST API for advertisers to manage advertisers, campaigns, and reporting.

    ## Authentication

    All endpoints require a Bearer token in the Authorization header:
    ```
    Authorization: Bearer your-api-key
    ```

    ## Base URL

    `https://api.interchange.io/api/v2/buyer`

    ## For AI Agents

    AI agents can use the MCP endpoint at `/mcp/v2/buyer` with three tools:
    - `initialize`: Start an MCP session
    - `api_call`: Make REST API calls
    - `ask_about_capability`: Learn about API features
servers:
  - url: https://api.interchange.io/api/v2/buyer
    description: Production server
security: []
tags:
  - name: Signup
    description: Request reviewed access to Interchange
  - name: Account
    description: Account management, service tokens, and preferences
  - name: Asks
    description: >-
      What you are waiting on Scope3 for — support, product, and supply asks in
      one list
  - name: Advertisers
    description: Manage advertisers
  - name: Product Discovery
    description: Discover and select products
  - name: Campaigns
    description: Manage advertising campaigns
  - name: Creatives
    description: Build, manage, and sync campaign creatives via AdCP Creative Protocol
  - name: Reporting
    description: Access performance metrics
  - name: Event Sources
    description: >-
      Manage event source configurations and log conversion/marketing events for
      attribution
  - name: Property Lists
    description: Validate property lists against AAO registry
  - name: Sales Agents
    description: View and connect sales agents
  - name: Measurement
    description: Measurement sources, records, context, and freshness
  - name: Syndication
    description: Syndicate resources to ADCP agents
  - name: Tasks
    description: Track async operation status
  - name: Buyer Billing
    description: >-
      Consolidated invoicing for buyers — invoices and pending invoice items
      issued by Scope3 across the buyer customer.
  - name: MCP
    description: Model Context Protocol endpoints for AI agents
paths:
  /advertiser-invitations/claim:
    servers:
      - url: https://api.interchange.io/api/v2
        description: Production server
    post:
      tags:
        - Advertisers
      summary: Claim an exact-recipient advertiser invitation
      description: >-
        Claim a one-time invitation as the directly authenticated WorkOS user
        whose verified email exactly matches the recipient. Claiming does not
        approve Seller admission or grant account access.
      operationId: claimOrganizationAdvertiserSelfServiceInvitation
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                claimToken:
                  type: string
                  minLength: 32
                  maxLength: 512
                idempotencyKey:
                  type: string
                  format: uuid
                  pattern: >-
                    ^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|ffffffff-ffff-ffff-ffff-ffffffffffff)$
              required:
                - claimToken
                - idempotencyKey
              additionalProperties: false
      responses:
        '200':
          description: Claim an exact-recipient advertiser invitation
          content:
            application/json:
              schema:
                $ref: >-
                  #/components/schemas/ClaimOrganizationAdvertiserInvitationApiResponse
        '400':
          description: Bad request
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '403':
          description: >-
            The caller email, token, expiry, delivery, principal, or active
            invitation does not match
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '500':
          description: Internal server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
      security:
        - bearerAuth: []
components:
  schemas:
    ClaimOrganizationAdvertiserInvitationApiResponse:
      type: object
      properties:
        data:
          $ref: '#/components/schemas/ClaimOrganizationAdvertiserInvitationResponse'
        error:
          type: string
          nullable: true
          enum:
            - null
      required:
        - data
        - error
      additionalProperties: false
    ErrorResponse:
      type: object
      properties:
        data:
          type: string
          nullable: true
          enum:
            - null
        error:
          $ref: '#/components/schemas/ApiError'
      required:
        - data
        - error
      additionalProperties: false
      description: Standard error response
    ClaimOrganizationAdvertiserInvitationResponse:
      type: object
      properties:
        admissionId:
          type: string
          format: uuid
          pattern: >-
            ^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|ffffffff-ffff-ffff-ffff-ffffffffffff)$
        advertiserId:
          type: string
          pattern: ^[1-9][0-9]*$
        admissionState:
          type: string
          enum:
            - pending
            - approved
            - rejected
            - suspended
            - revoked
        claimState:
          type: string
          enum:
            - claimed
        revision:
          type: string
          pattern: ^[1-9][0-9]*$
      required:
        - admissionId
        - advertiserId
        - admissionState
        - claimState
        - revision
      additionalProperties: false
      description: >-
        Authenticated exact-recipient claim. Seller approval remains a separate
        admission decision.
    ApiError:
      type: object
      properties:
        code:
          type: string
          description: Machine-readable error code
        message:
          type: string
          description: Human-readable error message
        field:
          description: Field path associated with the error
          type: string
        details:
          description: Additional error context
          type: object
          additionalProperties: {}
      required:
        - code
        - message
      additionalProperties: false
      description: Structured error object
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: API key or access token

````