LLD-2:ECommerces Checkout

E-Commerce Payment System - Strategy Pattern Implementation This is an implementation of the Strategy design pattern for handling multiple payment methods in an e-commerce checkout system. Problem Statement Building a backend for an online store like Flipkart or Amazon where users can pay using different payment methods. Each payment method requires different details and processing logic, but the system must remain extensible without using if-else chains. Class Diagram +------------------+ +----------------------+ | PaymentRequest |---------->| PaymentFactory | +------------------+ +----------------------+ | - type: Enum | | + getStrategy(req) | | - amount: double | +----------+-----------+ | - card/upi data | | +------------------+ | (Creates) v +------------------+ +----------------------+ | PaymentService | | PayStrategy | | (Context) | | (Interface) | +------------------+ +----------------------+ | - strategy |<>-------->| + pay(amount) | | + makePayment() | +----------+-----------