> ## 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. # Resolve media billing entity > Preview which configured media billing entity matches an advertiser or account (exactly one of advertiserId/childCustomerId): the advertiser's attachment wins, else its owning account's attachment, else the org PRIMARY entity when one exists, else unresolved. Purely structural; the invoice producer does not consume this result yet. ## OpenAPI ````yaml /v2/buyer-api-v2.yaml get /billing/media-entities/resolve 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: /billing/media-entities/resolve: servers: - url: https://api.interchange.io/api/v2 description: Production server get: tags: - Media Billing summary: Resolve media billing entity description: >- Preview which configured media billing entity matches an advertiser or account (exactly one of advertiserId/childCustomerId): the advertiser's attachment wins, else its owning account's attachment, else the org PRIMARY entity when one exists, else unresolved. Purely structural; the invoice producer does not consume this result yet. operationId: resolveMediaBillingEntity parameters: - in: query name: advertiserId schema: description: >- Resolve the media billing entity for this advertiser. Exactly one of advertiserId/childCustomerId must be provided. anyOf: - type: integer format: int64 - type: string - type: number description: >- Resolve the media billing entity for this advertiser. Exactly one of advertiserId/childCustomerId must be provided. - in: query name: childCustomerId schema: description: >- Resolve the media billing entity for this account (child customer). Exactly one of advertiserId/childCustomerId must be provided. anyOf: - type: number - type: string description: >- Resolve the media billing entity for this account (child customer). Exactly one of advertiserId/childCustomerId must be provided. responses: '200': description: Resolve media billing entity content: application/json: schema: $ref: '#/components/schemas/ResolveMediaBillingEntityResponse' '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: >- ACCESS_DENIED (the advertiser or account is outside your organization; for accounts this is also returned when the account does not exist, so existence cannot be probed). content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '404': description: NOT_FOUND (the advertiser does not exist). 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: ResolveMediaBillingEntityResponse: type: object properties: entity: nullable: true description: >- The entity selected by the configuration preview, or null when the org has no matching or primary entity. allOf: - $ref: '#/components/schemas/MediaBillingEntity' resolvedVia: type: string enum: - advertiser - account - org - none description: >- "advertiser" (the advertiser has its own attachment), "account" (its owning account does), "org" (the org primary fallback), or "none" (the org has no matching or primary entity). required: - entity - resolvedVia additionalProperties: false description: >- Previews which configured media billing entity matches an advertiser or account and which hierarchy level supplied it. The invoice producer does not consume this result yet. ErrorResponse: type: object properties: data: type: string nullable: true enum: - null error: $ref: '#/components/schemas/ApiError' required: - data - error additionalProperties: false description: Standard error response MediaBillingEntity: type: object properties: id: type: integer minimum: -9007199254740991 maximum: 9007199254740991 description: Media billing entity ID entityName: type: string minLength: 1 maxLength: 255 description: >- Legal name of the media billing entity (e.g. "WPP South Africa (Pty) Ltd"). countryCode: type: string pattern: ^[A-Z]{2}$ description: >- Stored country identity metadata for the billing entity, as an ISO 3166-1 alpha-2 code. It does not derive currency, tax/address behavior, or resolution. example: US currency: type: string pattern: ^[A-Z]{3}$ description: ISO 4217 currency code example: USD billingEmails: minItems: 1 maxItems: 20 type: array items: type: string format: email pattern: >- ^(?!\.)(?!.*\.\.)([A-Za-z0-9_'+\-\.]*)[A-Za-z0-9_+-]@([A-Za-z0-9][A-Za-z0-9\-]*\.)+[A-Za-z]{2,}$ description: >- Invoicing contact email(s) for this entity. At least one is required. addressLine1: type: string minLength: 1 maxLength: 255 description: Entity street address, line 1. addressLine2: nullable: true description: Entity street address, line 2 (optional). type: string maxLength: 255 city: type: string minLength: 1 maxLength: 128 description: Entity city. state: nullable: true description: Entity state/province/region (optional). type: string maxLength: 128 postalCode: type: string minLength: 1 maxLength: 32 description: Entity postal/ZIP code. taxId: nullable: true description: >- Tax identifier for this entity (e.g. VAT number, EIN), when applicable. type: string maxLength: 64 isPrimary: type: boolean description: >- Whether this is the org's PRIMARY media billing entity — the fallback in resolution previews when no advertiser or account attachment matches. At most one entity per org is primary; an org may have no entities at all. createdAt: type: string format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$ description: Creation timestamp (ISO 8601) updatedAt: type: string format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$ description: Last update timestamp (ISO 8601) required: - id - entityName - countryCode - currency - billingEmails - addressLine1 - city - postalCode - isPrimary - createdAt - updatedAt additionalProperties: false description: >- A media billing configuration entity used by resolution previews. The invoice producer does not consume it yet. 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 ````