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Create the customer before you build a pay-in, payout, or issued bank account. Capabilities, accounts, and transfers are scoped to that customer. Use externalId as the stable mapping to the corresponding record in your system.

Individual customers

An individual requires only type. Include profile fields you already know, and add more only when the current capability or task needs them. Create the customer with POST /v3/customers:
Store the returned data.id as CUSTOMER_ID. See Individual onboarding for policy context.

Business customers

A business requires business.legalName. Create the business with the same operation:
Store the returned data.id as CUSTOMER_ID. See Business onboarding for policy and document context. Add directors, owners, and other business participants when they are known or requested. This example creates a director with POST /v3/customers/{customerId}/related-parties:
Store the returned data.id as RELATED_PARTY_ID.

Read readiness from capabilities

A customer does not have a verification or readiness status in the API. Read the customer with GET /v3/customers/{customerId} for current profile data, then use capabilities and their openTaskIds to decide what the customer can do next.
Next, continue to Capabilities and tasks to discover and activate the product outcome you need.