How would you design the Order class to handle multiple payment methods (e.g., credit card, PayPal) while keeping the design scalable?

hard📝 Trade-off Q8 of 15

LLD - Design — Online Shopping Cart

AUse a Payment interface and let Order hold a Payment object

BAdd separate attributes for each payment method in Order

CStore payment details as plain strings in Order

DLet Cart handle payment methods instead of Order

Step-by-Step Solution

Solution:

Step 1: Understand scalability in payment handling
Adding attributes for each payment method is not scalable as new methods require code changes.
Step 2: Use interface-based design
Defining a Payment interface and letting Order hold a Payment object allows easy extension for new methods.
Final Answer:
Use a Payment interface and let Order hold a Payment object -> Option A
Quick Check:
Interface-based design = scalable payment handling [OK]

Quick Trick: Use interfaces to support multiple payment types flexibly [OK]

Common Mistakes:

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