advancedE-Commerce & Payments
Design a payment gateway (Stripe) — idempotency, ledger accuracy.
Tests whether you know how to guarantee exactly-once money movement and an auditable ledger under retries and failures. Asked at: Stripe, PayPal, Amazon
Ready to design this system end to end?
Generate a complete, structured system design answer — requirements, capacity estimation, API design, architecture, database choice, scaling, caching, fault tolerance, security, trade-offs, and more, walked through the way a strong senior engineer would in a real interview.
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