How do you apply Strategy pattern to implement multiple payment methods?

Short answer: Define a common interface, e.g., IPaymentStrategy with a method Pay(). Implement concrete strategies for each payment method (CreditCard, PayPal, etc.). Use a context class to invoke the selected strategy at runtime, enabling easy extension without modifying existing code.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.