API gateways, initially designed for tasks like TLS and rate limiting, are increasingly accumulating business logic, such as customer plan checks or data transformations, which deviates from their intended purpose. This drift occurs because gateways offer a convenient, centralized location for applying rules, but it leads to a disconnect between the teams owning the gateway and the domain logic, resulting in untested rules, inconsistent enforcement, and potential bottlenecks. To maintain a clean architecture, business rules should reside within the services they govern, allowing domain teams to directly manage and test them.
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