Business payment-method credential model

A PaymethodCredential, where supported, associates one business with one project-level Paymethod. This is distinct from the global payment-method definition and from a user's saved payment method.

Representative model fields include id, paymethod_id, business_id, sandbox, enabled, allowed_order_types, and the literal field maximun. The model also contains data and data_sandbox, which can hold credential configuration and must not be copied into documentation or examples. Relations include business, paymethod, sites, and devices.

If available, the operation applies administrator/business-manager access and business ownership checks. The public API reference does not list the /business/{business}/paymethods collection, so its availability and complete schema are unconfirmed.

See Business payment-method relations for the retained relation-loading behavior and payment method model for the global definition.