Software Design

Strategy Pattern: Clean Payment Processing

UML Class Diagrams · made in Skemio

UML class diagram showing CheckoutService referencing a PaymentStrategy interface, which is implemented by StripePayment and PayPalPayment classes.
UML class diagram showing CheckoutService referencing a PaymentStrategy interface, which is implemented by StripePayment and PayPalPayment classes.

What it shows

  • Eliminates nested if-else checks across critical billing pipelines.
  • Allows hot-swapping payment providers at runtime without downtime.
  • Adheres strictly to the Open/Closed Principle for new provider onboarding.

The takeaway

Encapsulate payment algorithms behind one interface so your checkout service never changes.

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