> ## 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. # Get fee invoice > One fee invoice with its line items (plan commitment, overage with IU quantity and rate, payments applied). Scoped to the caller’s org — another org’s invoice number is a 404. ## OpenAPI ````yaml /v2/buyer-api-v2.yaml get /billing/fee-invoices/{invoiceNumber} 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: /billing/fee-invoices/{invoiceNumber}: servers: - url: https://api.interchange.io/api/v2 description: Production server get: tags: - Buyer Billing summary: Get fee invoice description: >- One fee invoice with its line items (plan commitment, overage with IU quantity and rate, payments applied). Scoped to the caller’s org — another org’s invoice number is a 404. operationId: getFeeInvoice parameters: - in: path name: invoiceNumber schema: description: The invoice number to fetch type: integer maximum: 9007199254740991 minimum: 1 required: true description: The invoice number to fetch responses: '200': description: Get fee invoice content: application/json: schema: $ref: '#/components/schemas/FeeInvoice' '400': description: Bad request content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '401': description: Unauthorized content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '500': description: Internal server error content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' security: - bearerAuth: [] components: schemas: FeeInvoice: description: One fee invoice with its line items. type: object properties: invoiceNumber: description: Gapless sequential invoice number (platform-wide series) type: integer minimum: -9007199254740991 maximum: 9007199254740991 invoiceRef: description: Display reference for the invoice (e.g. "FEE-000042") example: FEE-000042 type: string cycleKey: description: The billing cycle the invoice covers (e.g. "2026-07") example: 2026-07 type: string cycleStart: description: Cycle start (ISO 8601, UTC calendar month) type: string format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$ cycleEnd: description: Cycle end, exclusive (ISO 8601) 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))$ currency: description: ISO 4217 currency code example: USD type: string minLength: 3 maxLength: 3 pattern: ^[A-Z]{3}$ totalMinor: description: >- Outstanding balance in minor units: amounts owed minus payments applied. 0 once fully settled. type: integer minimum: -9007199254740991 maximum: 9007199254740991 issuedAt: description: When the invoice was issued (ISO 8601) 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))$ paidAt: description: >- When the balance reached zero (ISO 8601), or null while any amount is outstanding nullable: true 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))$ lines: description: >- Invoice line items in write order. `commitment`/`overage` lines are frozen at issuance; `payment_applied` lines may be appended as charges settle. type: array items: $ref: '#/components/schemas/FeeInvoiceLine' required: - invoiceNumber - invoiceRef - cycleKey - cycleStart - cycleEnd - currency - totalMinor - issuedAt - paidAt - lines additionalProperties: false ErrorResponse: description: Standard error response type: object properties: data: type: string nullable: true enum: - null error: $ref: '#/components/schemas/ApiError' required: - data - error additionalProperties: false FeeInvoiceLine: description: One line item on a fee invoice. type: object properties: lineKind: description: >- What the invoice line is: the plan commitment for the cycle, usage overage (IUs × rate), or a payment applied against the balance (negative amount). type: string enum: - commitment - overage - payment_applied description: description: Human-readable description of the line type: string quantity: description: >- Intelligence Units the line covers — set on overage lines, null otherwise nullable: true type: number unitRateMinor: description: >- Per-IU overage rate in minor units — set on overage lines, null otherwise nullable: true type: integer minimum: -9007199254740991 maximum: 9007199254740991 amountMinor: description: >- Line amount in minor units. Positive for amounts owed (commitment, overage); negative for payments applied. type: integer minimum: -9007199254740991 maximum: 9007199254740991 createdAt: description: When the line was written (ISO 8601) type: string format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$ required: - lineKind - description - quantity - unitRateMinor - amountMinor - createdAt 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 ````