> ## Documentation Index > Fetch the complete documentation index at: https://docs.filexpress.app/llms.txt > Use this file to discover all available pages before exploring further. # Get purchase (v2) > Same as v1 plus the currency reference. Amounts in `totals` and `products` are in base currency. **Required permission:** `expenses` ## OpenAPI ````yaml /api-reference/openapi.en.json get /v2/expenses/{id} openapi: 3.0.3 info: title: FileXpress External API version: 1.0.0 description: >- API for integrating third-party systems with FileXpress: billing, HR, accounting, inventory, projects, accounts receivable and payable, treasury, pricing and promotions, and cash. Current base URL: /api/external/v1. The legacy unversioned path (/api/external) will be removed on January 1, 2027; migrate to /api/external/v1 (same endpoints, only the base URL changes). The v2 API (/api/external/v2) exposes currencies and exchange rates, sales and purchases in foreign currency, taxes by id, payrolls with branch, and errors with a stable `code`; its operations carry the /v2 prefix in the path. We suggest migrating to the available v2 routes before March 30, 2027. servers: - url: https://api.filexpress.app/api/external/v1 description: Production security: - ApiKey: [] tags: - name: General - name: Billing · Sales - name: Billing · Purchases - name: Billing · Customers - name: Billing · Suppliers - name: Billing · Products - name: Catalogs - name: HR · Employees - name: HR · Attendance - name: HR · Labor rules - name: HR · Schedules - name: HR · Holidays - name: HR · Attendance results - name: HR · Leave requests - name: HR · Payrolls - name: Accounting - name: Inventory - name: Projects - name: Accounts receivable - name: Accounts payable - name: Treasury - name: Pricing and promotions - name: Cash - name: Points of sale - name: API v2 · General - name: API v2 · Currencies and rates - name: API v2 · Countries - name: API v2 · Sales - name: API v2 · Purchases - name: API v2 · Payrolls paths: /v2/expenses/{id}: get: tags: - API v2 · Purchases summary: Get purchase (v2) description: >- Same as v1 plus the currency reference. Amounts in `totals` and `products` are in base currency. **Required permission:** `expenses` parameters: - name: id in: path required: true description: Purchase ID schema: type: string format: uuid example: 9d1c5a3e-4b7f-4e2a-9c1d-2f6b8a0e7c11 responses: '200': description: Success content: application/json: example: status: true data: expense_id: 9d1c5a3e-4b7f-4e2a-9c1d-2f6b8a0e7c11 generation_code: A1B2C3D4-5E6F-4A7B-8C9D-0E1F2A3B4C5D control_number: DTE-03-M001P001-000000000000123 document_type: ccf status: processed issue_time: '2026-10-21 10:00:00' payment_status: pending is_credit: true provider: id: 3b8e2f10-7c4d-4a9e-b1f2-5d6c7e8f9a01 legal_name: Distribuidora XYZ S.A. de C.V. provider_name: Distribuidora XYZ totals: expense_total: 120 expense_to_payment: 133.24 products: - sku: COM-001 name: Diésel quantity: 5 individual_price: 12.8 subtotal: 64 currency_code: GTQ exchange_rate: '0.12800000' foreign_total: '1040.94' base_currency_code: USD '401': $ref: '#/components/responses/E401' '403': $ref: '#/components/responses/E403' '404': description: Purchase does not exist or belongs to another business content: application/json: schema: $ref: '#/components/schemas/V2Error' example: status: false message: Expense not found '429': $ref: '#/components/responses/E429' servers: - url: https://api.filexpress.app/api/external description: Production (v2 routes are prefixed with /v2) components: responses: E401: description: Missing or invalid API Key content: application/json: example: status: false message: Invalid API Key. E403: description: Integration without the required permission or deactivated content: application/json: example: status: false message: This integration does not have the 'hr.employees' permission. required_scope: hr.employees E429: description: Rate limit exceeded content: application/json: example: status: false message: Rate limit exceeded. Please try again later. rate_limit: 100 schemas: V2Error: type: object properties: status: type: boolean example: false code: type: string description: >- Stable error code. Evaluate this field instead of the `message` text. Responses from the access layer (API Key, permission, rate limit) and the 404 for a resource of another business may not include it: use the HTTP code. enum: - currency_not_enabled - exchange_rate_not_found - exchange_rate_invalid - base_currency_not_legal - validation_error - tax_invalid - payment_method_invalid - tax_not_supported_in_expenses - country_not_supported - country_data_invalid - idempotency_key_reused - idempotency_in_progress - unauthorized - forbidden - not_found - rate_limited - error message: type: string errors: oneOf: - type: object additionalProperties: true description: Field -> message(s) (validation and currency). - type: array description: 'Only in `tax_invalid`: one entry per tax problem.' items: type: object properties: field: type: string code: type: string description: Detail of the tax problem. enum: - tax_not_found - tax_wrong_effect - tax_country_mismatch - tax_not_in_lines - tax_totals_inconsistent - tax_amount_mismatch - withholding_totals_inconsistent - withholding_amount_mismatch message: type: string tax_id: type: string format: uuid required: - field - code - message description: Optional. Its shape depends on the error. required: - status - message securitySchemes: ApiKey: type: apiKey in: header name: X-API-Key description: Integration API Key (Integrations → New Integration). ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.