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

# Connect a generation-provider key for an advertiser

> Store a buyer generation-provider API key assigned to this advertiser so generation runs on the buyer's own account. The raw key is held in the secret manager; only a reference and a masked hint are persisted. Gated behind buyer-creative-v2 and buyer-generative-creative.



## OpenAPI

````yaml /v2/buyer-api-v2.yaml post /advertisers/{advertiserId}/creative/model-credentials
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: Account
    description: Account management, service tokens, and preferences
  - 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: Planning Briefs
    description: >-
      Share prospective briefs with publishers and collect their
      fit/quote/clarify/decline/book responses (gated by the
      demand-supply-signals flag).
  - 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:
  /advertisers/{advertiserId}/creative/model-credentials:
    post:
      tags:
        - Creatives
      summary: Connect a generation-provider key for an advertiser
      description: >-
        Store a buyer generation-provider API key assigned to this advertiser so
        generation runs on the buyer's own account. The raw key is held in the
        secret manager; only a reference and a masked hint are persisted. Gated
        behind buyer-creative-v2 and buyer-generative-creative.
      operationId: connectCreativeModelCredential
      parameters:
        - in: path
          name: advertiserId
          schema:
            description: Unique identifier for the advertiser
            example: '12345'
            type: string
            minLength: 1
          required: true
          description: Unique identifier for the advertiser
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ConnectBuyerModelCredentialBody'
      responses:
        '200':
          description: Connect a generation-provider key for an advertiser
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BuyerModelCredential'
        '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: >-
            Feature not enabled for this account (buyer-creative-v2 or
            buyer-generative-creative is off).
          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:
    ConnectBuyerModelCredentialBody:
      type: object
      properties:
        providerType:
          type: string
          enum:
            - audiostack
            - elevenlabs
            - fal
            - gemini
            - openai
            - veo
        apiKey:
          type: string
          minLength: 1
        label:
          type: string
          minLength: 1
          maxLength: 120
      required:
        - providerType
        - apiKey
        - label
    BuyerModelCredential:
      type: object
      properties:
        id:
          type: string
        customerId:
          type: integer
          minimum: -9007199254740991
          maximum: 9007199254740991
        advertiserIds:
          type: array
          items:
            type: string
        isDefault:
          type: boolean
        providerType:
          type: string
        providerDisplayName:
          type: string
        label:
          type: string
        status:
          type: string
          enum:
            - ACTIVE
            - REVOKED
            - ERROR
        maskedKey:
          nullable: true
          type: string
        connectedBy:
          nullable: true
          type: string
        createdAt:
          type: string
        updatedAt:
          type: string
      required:
        - id
        - customerId
        - advertiserIds
        - isDefault
        - providerType
        - providerDisplayName
        - label
        - status
        - maskedKey
        - connectedBy
        - createdAt
        - updatedAt
      additionalProperties: false
    ErrorResponse:
      description: Standard error response
      type: object
      properties:
        data:
          type: string
          nullable: true
          enum:
            - null
        error:
          $ref: '#/components/schemas/ApiError'
      required:
        - data
        - error
      additionalProperties: false
    ApiError:
      description: Structured error object
      type: object
      properties:
        code:
          description: Machine-readable error code
          type: string
        message:
          description: Human-readable error message
          type: string
        field:
          description: Field path associated with the error
          type: string
        details:
          description: Additional error context
          type: object
          additionalProperties: {}
      required:
        - code
        - message
      additionalProperties: false
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: API key or access token

````