> ## Documentation Index > Fetch the complete documentation index at: https://docs.beinfi.com/llms.txt > Use this file to discover all available pages before exploring further. # Get a customer > Given a customer ID, returns the customer and all their enrollments (`CustomerDetail`). Given an enrollment ID, returns just that enrollment (`ProductCustomer`). ## OpenAPI ````yaml /api-reference/openapi.en.json get /customers/{customerID} openapi: 3.1.0 info: title: Infi API version: 0.0.1 description: > The Infi REST API: catalog, customers, usage metering, subscriptions, invoices, payments and checkout. **Authentication.** Send your secret key as `Authorization: Bearer sk_test_…` (sandbox) or `sk_live_…` (production). The key prefix selects the environment. Checkout routes (`/pay/*`) and `/public/*` take no key: they run in the payer's browser. **Idempotency.** Every request that changes data requires an `Idempotency-Key` header. A retry with the same key returns the original response instead of running again. **Amounts.** Money and quantities travel as decimal strings (`"150.00"`, `"0.0001"`), never as floating-point numbers. **Errors.** The body carries `error_code` (stable, branch on it), `message` (for humans) and `tracer_id` (send it to support). Rate-limit and idempotency errors are nested under `error`, with `code` and `request_id`. servers: - url: https://api-sandbox.beinfi.com description: Sandbox - url: https://api.beinfi.com description: Production security: - bearerAuth: [] tags: - name: Catalog - name: Customers - name: Metering - name: Subscriptions - name: Invoices - name: Payments - name: Checkout - name: Coupons - name: Billing - name: Account - name: Webhooks - name: Test account - name: Rail - name: Storefronts paths: /customers/{customerID}: parameters: - $ref: '#/components/parameters/CustomerID' get: tags: - Customers summary: Get a customer description: > Given a customer ID, returns the customer and all their enrollments (`CustomerDetail`). Given an enrollment ID, returns just that enrollment (`ProductCustomer`). operationId: getCustomer responses: '200': content: application/json: schema: oneOf: - $ref: '#/components/schemas/CustomerDetail' - $ref: '#/components/schemas/ProductCustomer' description: The customer or the enrollment. '401': $ref: '#/components/responses/Unauthorized' '404': $ref: '#/components/responses/NotFound' components: parameters: CustomerID: name: customerID in: path required: true schema: type: string format: uuid description: Customer ID. schemas: CustomerDetail: allOf: - $ref: '#/components/schemas/Customer' - type: object properties: enrollments: type: array items: $ref: '#/components/schemas/ProductCustomer' description: The customer and all their enrollments. ProductCustomer: type: object properties: id: type: string format: uuid description: Enrollment ID. This is the one billing and usage calls expect. customerId: type: string format: uuid description: Customer ID. Do not use it for billing and usage calls; use `id`. productId: type: string format: uuid externalId: type: string description: The customer's id in your own system. name: type: - string - 'null' email: type: - string - 'null' taxId: type: - string - 'null' description: CPF or CNPJ. pspRef: type: - string - 'null' description: >- The customer's reference with the payment processor, when there is one. metadata: type: object additionalProperties: true description: The free-form data sent at enrollment. creditAlertSent: type: boolean description: >- Whether the low-balance alert has already been sent for this enrollment. createdAt: type: string format: date-time description: >- An enrollment: this customer in this product. The `id` is the enrollment ID that subscriptions, invoices, usage and balances reference. Customer: type: object properties: id: type: string format: uuid description: Customer ID. Not the enrollment ID. externalId: type: string description: This customer's id in your own system. name: type: - string - 'null' email: type: - string - 'null' taxId: type: - string - 'null' description: CPF or CNPJ. phone: type: - string - 'null' description: >- Contact phone, in international format as digits only, without `+` (for example `5511999999999`). Used for contact; it does not identify the customer. pspRef: type: - string - 'null' description: >- The customer's reference with the payment processor, when there is one. createdAt: type: string format: date-time description: >- The payer, at the level of your account. `externalId` is unique within the account. Error: type: object required: - message - error_code - tracer_id properties: message: type: string description: Human-readable sentence. error_code: $ref: '#/components/schemas/ErrorCode' description: Stable error code. Branch on it. tracer_id: type: string description: Request id. Include it when contacting support. description: >- The standard error body. It is flat (no `error` wrapper) and the trace id is `tracer_id`. NotFoundError: type: object required: - message - error_code - tracer_id - resource properties: message: type: string error_code: $ref: '#/components/schemas/ErrorCode' tracer_id: type: string resource: type: string ErrorCode: type: string examples: - internal_error - validation_failed - bad_request - unauthorized - forbidden - not_found - conflict - rate_limited description: >- Stable error code. The list is open: besides the generic codes, each area defines its own (`coupon_expired`, `insufficient_balance`, `version_not_draft`, `idempotency_key_reused`…). Handle a code you do not recognize by its HTTP status and show `message`; do not fail parsing the response. responses: Unauthorized: content: application/json: schema: $ref: '#/components/schemas/Error' description: Missing or invalid API key. NotFound: content: application/json: schema: $ref: '#/components/schemas/NotFoundError' description: Resource not found. securitySchemes: bearerAuth: type: http scheme: bearer description: >- Your account's secret key: `Authorization: Bearer sk_test_…` or `sk_live_…`. Server-side only. ````