[jimmyn]

Regenerated from OpenAPI v1.12.3.

• CustomersApi, exposed as monei.customers: create, get, update, delete, list_payment_methods, delete_payment_method
• New models: Customer, CreateCustomerRequest, UpdateCustomerRequest, CustomerPaymentMethod, DeletedResource, ConflictError
• customer_id and use_default_payment_method on CreatePaymentRequest; customer_id on Payment, Subscription, CreateSubscriptionRequest, UpdateSubscriptionRequest
• README: Customer Operations section
• test/test_customers.py: HTTP-layer tests for method, path and camelCase body (update, delete_payment_method, payment with the default method)

Summary by CodeRabbit

• New Features
  • Added customer management capabilities, including creating, retrieving, updating, and deleting customers.
  • Added support for listing and removing a customer’s saved payment methods.
  • Added customer associations for payments and subscriptions, including use of a customer’s default saved payment method.
• Documentation
  • Added guidance for customer operations and managing saved payment methods.
• Tests
  • Added coverage for customer updates, payment-method removal, and payments using a customer’s default method.