> ## Documentation Index > Fetch the complete documentation index at: https://docs.grainfinance.co/llms.txt > Use this file to discover all available pages before exploring further. # Get Customer > Retrieves a specific customer by its Grain customer ID. ## OpenAPI ````yaml GET /customers/{customerId} openapi: 3.1.0 info: title: Grain API version: 1.0.0 description: >- Grain's API provides a comprehensive set of endpoints for managing hedging, spot transactions, pricing, and fund movements - enabling seamless integration of FX workflows into your platform. Each API call follows REST conventions, uses secure authentication, and returns standardized responses for consistency across environments. license: name: Creative Commons Attribution 3.0 contact: name: Grain Finance url: https://docs.grainfinance.co email: support@grainfinance.co termsOfService: https://grainfinance.co/terms-of-service/ x-apiClientRegistration: url: https://grainfinance.co/partners servers: - url: https://api.grainfinance.co/v1 description: Grain API security: [] tags: - name: Hedges description: >- Hedge objects represent transactions that lock exchange rates for future dates. A single hedge locks an exchange rate for a future transaction between two currencies. - name: Dual Hedges description: >- A dual hedge mitigates FX risk by automatically generating two linked hedge legs - a customer leg and a supplier leg - both routed through the customer's functional currency. This structure reduces exposure to currency fluctuations for both cash flow and accounting purposes, while allowing independent tracking and reporting of each hedge leg. - name: Customers description: >- Customer objects represent your end customers on the Grain platform. A customer must be created before a hedge or spot transaction can be initiated. - name: Pricing description: >- Pricing endpoints provide access to FX rates for currency pairs that are not being hedged. These endpoints can be used for live rate display or bulk retrieval to support high-volume quoting workflows. - name: Spots description: >- Spot objects represent currency conversions executed for immediate or near-term settlement. - name: Conversions description: >- Conversion objects represent currency conversions executed for immediate or near-term settlement. - name: Wallets description: Endpoints to view balances, manage funding, and perform transfers. paths: /customers/{customerId}: get: tags: - Customers description: Retrieves a specific customer by its Grain customer ID. operationId: Get parameters: - description: The UUID of the customer in: path name: customerId required: true schema: $ref: '#/components/schemas/UUID' responses: '200': description: Customer Found content: application/json: schema: $ref: '#/components/schemas/Customer' '404': description: The request failed because the resource does not exist. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' security: - api-key: [] components: schemas: UUID: type: string format: uuid description: |- Stringified UUIDv4. See [RFC 4112](https://tools.ietf.org/html/rfc4122) pattern: >- [0-9A-Fa-f]{8}-[0-9A-Fa-f]{4}-4[0-9A-Fa-f]{3}-[89ABab][0-9A-Fa-f]{3}-[0-9A-Fa-f]{12} Customer: properties: id: $ref: '#/components/schemas/UUID' description: The id of the customer within the Grain platform. example: 1b0ada1e-fa1b-4cfe-a553-01b340c5650e companyName: type: string description: The legal name of the customer's company example: Ollivander's Wand Shop companyAddress: type: string description: The address of the company example: 12 Diagon Alley companyCity: type: string description: The city of the company example: London companyState: type: string description: The state the company is in (US based) example: London companyCountry: $ref: '#/components/schemas/CountryCode' contactEmail: $ref: '#/components/schemas/ContactEmail' description: The email for the company's primary contact example: customer@company.com contactFullName: type: string description: The name of the company's primary contact example: Garrick Ollivander contactPhoneNumber: type: string description: The phone number of the company's primary contact example: '+12125551234' companyTaxId: type: string description: The tax identification or registration number of the company example: 123-45-6789 externalCustomerId: type: string description: The id used to identify the customer within your platform example: 630231b3ae0d7e9e5097ad35 status: $ref: '#/components/schemas/CustomerStatus' extraFields: $ref: '#/components/schemas/CustomersExtraFieldsParam' description: |- Additional fields that provide further details about the customer. These fields should be specified as a valid JSON object. example: field_a: value_a field_b: value_b required: - id - companyName - companyCountry - externalCustomerId - status type: object additionalProperties: false ErrorResponse: description: An API Error properties: message: type: string description: A short explanation of the error. example: Can't perform this action reason: type: string description: A detailed description of the reason for the failure. example: >- Supplied object is in *Cancelled* state, which prevents performing this action required: - message type: object additionalProperties: false CountryCode: type: string example: GB description: The alpha-2 ISO 3166 country code of the entity's country. pattern: ^[A-Za-z]{2}$ ContactEmail: type: string example: garrick@ollivanders.co.uk description: The email address of the company's primary contact CustomerStatus: description: The eligibility of the customer to receive quotes enum: - Pending - Approved - Rejected type: string CustomersExtraFieldsParam: properties: {} additionalProperties: anyOf: - type: string - type: number format: double - type: boolean type: object example: field_a: value_a field_b: value_b description: |- Additional fields that provide further details about the company. These fields should be specified as a valid JSON object. securitySchemes: api-key: type: http scheme: basic description: >- Basic authentication using the partner API keys from https://console.grainfinance.co/keys ````