Software Design

Adapter Pattern: Isolating Third-Party APIs

UML Class Diagrams · made in Skemio

UML class diagram displaying CheckoutService using PaymentGateway interface, implemented by StripeAdapter which delegates to legacy StripeApi.

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What it shows

Wraps awkward external interfaces into a domain-controlled contract.
Shields domain services from third-party breaking API updates.
Enables instant swapping or mock testing of external payment vendors.

The takeaway

Never let third-party vendor schemas leak into your domain; isolate them behind an adapter.

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