Enterprise Base Pattern Catalogv1.0.0

When integrating a third-party shipping API, create a Gateway to wrap the API calls, providing a simplified interface and isolating the rest of the application from changes in the external system.

Avoid floating-point errors in monetary calculations by using the Money pattern, which encapsulates currency, precision, and allocation by ratio, crucial for accounting or billing systems.

Replace scattered null checks for missing customers or orders with a Null Object (Special Case) that provides default behavior, reducing code complexity and preventing NullPointerExceptions.

When a core module needs to reference a low-level service without coupling, define the interface in the core module and implement it elsewhere, enabling easier testing and swapping implementations.

When writing unit tests for a service that calls an external payment gateway, use a Service Stub to simulate the gateway's responses, enabling deterministic tests without network calls.

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