> ## 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 registered AdCP source (alpha) > Project an existing registered, discovered, and advertiser-mapped AdCP source account into the connected-account campaign connection plane. This operation does not accept endpoint URLs or raw secrets. ## OpenAPI ````yaml /v2/buyer-api-v2.yaml post /storefronts/{storefrontId}/sources/{sourceId}/adcp-connection 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: /storefronts/{storefrontId}/sources/{sourceId}/adcp-connection: post: tags: - Storefronts summary: Connect a registered AdCP source (alpha) description: >- Project an existing registered, discovered, and advertiser-mapped AdCP source account into the connected-account campaign connection plane. This operation does not accept endpoint URLs or raw secrets. operationId: connectAdcpStorefront parameters: - in: path name: storefrontId schema: description: Storefront ID type: integer maximum: 9007199254740991 minimum: 1 required: true description: Storefront ID - in: path name: sourceId schema: description: Inventory source ID type: string minLength: 1 required: true description: Inventory source ID requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/ConnectAdcpStorefrontBody' responses: '201': description: Connect a registered AdCP source (alpha) content: application/json: schema: $ref: '#/components/schemas/ConnectedAdcpStorefront' '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: >- Customer alpha exposure is disabled or the advertiser is outside the caller customer scope. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '409': description: >- The account-wide agent credential is already associated with another source. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '422': description: >- The registered seller source has not passed source-specific conformance. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '500': description: Internal server error content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' security: - bearerAuth: [] components: schemas: ConnectAdcpStorefrontBody: description: >- Project a registered and advertiser-mapped AdCP storefront source into the connected-account campaign connection plane. type: object properties: advertiserId: description: Advertiser already mapped to the selected AdCP source account. type: string pattern: ^[1-9]\d*$ accountId: description: AdCP account identifier returned by list_available_accounts. type: string minLength: 1 credentialId: description: >- Credential identifier returned by list_available_accounts. Required when more than one credential exposes the same account identifier. type: string pattern: ^[1-9]\d*$ required: - advertiserId - accountId additionalProperties: false ConnectedAdcpStorefront: description: >- Connection/account identifiers for a registered AdCP storefront source ready for an explicit tracked-campaign subscription. type: object properties: connectionId: type: string connectionAccountId: type: string storefrontId: type: string sourceId: type: string agentId: type: string advertiserId: type: string externalAccountId: type: string providerType: type: string enum: - adcp connectionKind: type: string enum: - THIRD_PARTY_AGENT required: - connectionId - connectionAccountId - storefrontId - sourceId - agentId - advertiserId - externalAccountId - providerType - connectionKind 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 ````