> ## Documentation Index > Fetch the complete documentation index at: https://developer.fabric.inc/llms.txt > Use this file to discover all available pages before exploring further. # Acknowledge financial transaction > When an order is created or processed, fabric generates invoice and sends it to merchants or third-party systems for further financial processing of the order. This endpoint lets merchants acknowledge that they have received the invoice with payment information. ## OpenAPI ````yaml invoices.openapi post /invoices/{invoiceId}/acknowledge openapi: 3.0.1 info: contact: email: support@fabric.inc name: fabric Support Team description: >- fabric **Invoices** API helps in generating invoices that can be used by any third party system for order fulfillment operation. license: name: fabric API License url: https://fabric.inc/api-license termsOfService: https://fabric.inc/terms-of-use title: Orders - Invoices API version: 3.0.0 x-audience: external-public servers: - description: Production url: https://api.fabric.inc/v3 security: - authorization: [] tags: - description: >- fabric **Invoices** API helps in generating invoices that can be used by any third party system for order fulfillment operation. name: Invoices externalDocs: description: Find out more about fabric Orders (also called OMS) url: https://developer.fabric.inc/v3/docs/orders-overview paths: /invoices/{invoiceId}/acknowledge: post: tags: - Invoices summary: Acknowledge financial transaction description: >- When an order is created or processed, fabric generates invoice and sends it to merchants or third-party systems for further financial processing of the order. This endpoint lets merchants acknowledge that they have received the invoice with payment information. operationId: acknowledgeFinancialPosting parameters: - description: 24 character system-generated invoice ID example: 63bec1244258060b3d027617 in: path name: invoiceId required: true schema: type: string - $ref: '#/components/parameters/xFabricTenantId' - $ref: '#/components/parameters/xFabricChannelId' - $ref: '#/components/parameters/xFabricRequestId' requestBody: content: application/json: schema: $ref: '#/components/schemas/financialPostingAcknowledgeRequest' required: true responses: '200': content: application/json: schema: $ref: '#/components/schemas/financialPostingAcknowledgeResponse' description: OK headers: x-fabric-request-id: $ref: '#/components/headers/xFabricRequestIdResponseHeader' '400': content: application/json: example: errors: - message: Invalid request type: CLIENT_ERROR message: Bad request type: CLIENT_ERROR schema: $ref: '#/components/schemas/errorResponse' description: Bad request headers: x-fabric-request-id: $ref: '#/components/headers/xFabricRequestIdResponseHeader' '401': content: application/json: example: message: Unauthorized request type: CLIENT_ERROR schema: $ref: '#/components/schemas/errorResponse' description: Unauthorized headers: x-fabric-request-id: $ref: '#/components/headers/xFabricRequestIdResponseHeader' '404': content: application/json: schema: $ref: '#/components/schemas/errorResponse' example: message: Not found type: CLIENT_ERROR description: Not found headers: x-fabric-request-id: $ref: '#/components/headers/xFabricRequestIdResponseHeader' '500': content: application/json: example: message: Internal server error type: SERVER_ERROR schema: $ref: '#/components/schemas/errorResponse' description: Internal server error headers: x-fabric-request-id: $ref: '#/components/headers/xFabricRequestIdResponseHeader' components: parameters: xFabricTenantId: description: >- A header used by fabric to identify the tenant making the request. You must include tenant id in the authentication header for an API request to access any of fabric’s endpoints. You can retrieve the tenant id , which is also called account id, from [Copilot](/v3/platform/settings/account-details/getting-the-account-id). This header is required. example: 5f328bf0b5f328bf0b5f328b in: header name: x-fabric-tenant-id required: true schema: type: string xFabricChannelId: description: >- x-fabric-channel-id identifies the sales channel where the API request is being made; primarily for multichannel use cases. The channel ids are 12 corresponding to US and 13 corresponding to Canada. The default channel id is 12. This field is required. example: '12' in: header name: x-fabric-channel-id required: true schema: type: string xFabricRequestId: description: Unique request ID example: 263e731c-45c8-11ed-b878-0242ac120002 in: header name: x-fabric-request-id required: false schema: type: string schemas: financialPostingAcknowledgeRequest: description: Request sample for acknowledging financial transaction properties: acknowledgedAt: description: >- Financial transaction acknowledgment time for the invoice. If omitted, fabric uses the time (UTC) of invoice acknowledgement call. example: '2022-08-01T20:03:28.483Z' format: date-time type: string attributes: description: >- Merchant-defined custom attributes. This is a placeholder for additional info in key: value pairs example: fraudCheckStatus: UPDATED fraudStatus: FRAUD_PASS type: object required: - acknowledgedAt type: object financialPostingAcknowledgeResponse: description: Financial transaction acknowledgement response properties: message: description: Generic response example: Success type: string type: object errorResponse: description: Error response properties: errors: description: Errors items: $ref: '#/components/schemas/errorResponse' type: array message: description: Error message example: Bad request type: string type: description: Error type example: CLIENT_ERROR type: string type: object headers: xFabricRequestIdResponseHeader: description: Unique request ID example: 263e731c-45c8-11ed-b878-0242ac120002 required: false schema: type: string securitySchemes: authorization: bearerFormat: JWT scheme: bearer type: http ````