> ## 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. # Create a buyer-instructions row > Create a new buyer-instructions row. The (operatorDomain, brandDomain) tuple is unique per storefront — duplicate scopes return 409; use PATCH to update an existing row. ## OpenAPI ````yaml /v2/storefront-api-v2.yaml post /buyer-instructions openapi: 3.0.0 info: title: Scope3 Storefront API version: 2.0.0 description: |- REST API for partners to manage storefronts, inventory sources, and billing. ## Authentication All endpoints require a Bearer token in the Authorization header: ``` Authorization: Bearer your-api-key ``` ## Base URL `https://api.interchange.io/api/v2/storefront` ## For AI Agents AI agents can use the MCP endpoint at `/mcp/v2/storefront` 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/storefront description: Production server security: [] tags: - name: Account description: Account management, service tokens, and preferences - name: Storefront description: Manage storefront and inventory sources - name: Storefront Agents description: List and manage registered sales, signals, and outcomes agents - name: Storefront Activity description: Audit log of configuration and inventory changes on the storefront - name: Storefront Billing description: Payout bank details and billing configuration for storefronts - name: AI Usage description: Storefront AI token usage visibility by model - name: MCP description: Model Context Protocol endpoints paths: /buyer-instructions: post: tags: - Storefront summary: Create a buyer-instructions row description: >- Create a new buyer-instructions row. The (operatorDomain, brandDomain) tuple is unique per storefront — duplicate scopes return 409; use PATCH to update an existing row. operationId: createBuyerInstructions requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/CreateBuyerInstructionsBody' responses: '201': description: Create a buyer-instructions row content: application/json: schema: $ref: '#/components/schemas/BuyerInstructionsResponse' '400': description: Bad request content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '401': description: Unauthorized content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '409': description: >- A buyer-instructions row already exists for this (operatorDomain, brandDomain) on the storefront. Use PATCH to update it. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '500': description: Internal server error content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' security: - bearerAuth: [] components: schemas: CreateBuyerInstructionsBody: description: >- Request body for creating a buyer-instructions row. (operatorDomain, brandDomain) is unique per storefront — duplicate scopes fail with a validation error; use PATCH instead. type: object properties: operatorDomain: description: >- Operator (e.g. agency/DSP) the row applies to, or null to match any operator. (operatorDomain, brandDomain) form the scope — one of the four shapes: house (both null), house+brand (brand only), operator (operator only), operator+brand (both). nullable: true example: nike.com type: string minLength: 1 maxLength: 253 brandDomain: description: >- Advertiser brand the row applies to, or null to match any brand. See operatorDomain for the four scope shapes. nullable: true example: nike.com type: string minLength: 1 maxLength: 253 discountPercent: description: >- Discount percent off the storefront base price for buys that match this scope. Null = no discount contribution. nullable: true example: 15 type: number minimum: 0 maximum: 100 notes: description: >- Freeform notes the Merchandising Agent applies to compositions for matching buyers (e.g. "Brand requires GroupM viewability ≥ 70%"). Null = no notes contribution. nullable: true type: string maxLength: 2000 countries: description: Optional country filter. Null = row applies regardless of country. nullable: true example: - US - CA minItems: 1 type: array items: type: string pattern: ^[A-Z]{2}$ required: - operatorDomain - brandDomain - discountPercent - notes - countries BuyerInstructionsResponse: description: A single buyer-instructions row. type: object properties: id: description: Surrogate id (BIGINT serialized as string). example: '17' type: string storefrontId: description: Storefront the row belongs to (BIGINT serialized as string). example: '1234' type: string operatorDomain: nullable: true type: string brandDomain: nullable: true type: string discountPercent: nullable: true type: number notes: nullable: true type: string countries: nullable: true type: array items: type: string 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))$ 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))$ createdBy: nullable: true type: string required: - id - storefrontId - operatorDomain - brandDomain - discountPercent - notes - countries - createdAt - updatedAt - createdBy 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 ````