Payment Gateway System — PayPal

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Payment Gateway System[ OK ] 219 — full content available
[ INFO ] category: System Design  difficulty: hard  freq: high  first seen: 2026-01-13
[HARD][SYSTEM DESIGN][HIGH]BackendwebbackendPaymentSystem Design
$ cat problem.md
Design a Payment Gateway System.
Key Requirements:
High-level system components and architecture
Payment transaction flows between services
Implementation of a ledger system to ensure consistency and traceability
Handle high transaction volume
Security and fraud prevention
Idempotency for transactions
user@intervues:~/paypal$ 
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[ OK ] Loaded  — 
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user@intervues:~/$ 