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System Design Question

Design an Online Payment System like PayPal

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Functional Requirements:

  • Users can register, log in, and manage their accounts.
  • Users can add and verify payment methods (e.g., credit card, bank account).
  • Users can send payments to other users using email or username.
  • Users can receive payments and withdraw funds to their bank accounts.
  • Users can view their transaction history and current balance.
  • The system must process transactions securely and reliably.
  • Admins can monitor transactions and manage user accounts for compliance.

Non-Functional Requirements:

  • Security: All sensitive data must be encrypted in transit and at rest. The system should have fraud detection and prevention mechanisms.
  • Availability: The system should be highly available, targeting 99.9% uptime.
  • Scalability: The system should handle growth in users and transaction volume.
  • Performance: Transactions should be processed within a few seconds.
  • Reliability: The system must ensure no loss or duplication of transactions.
  • Compliance: The system must comply with relevant financial regulations (e.g., KYC, AML).
  • Usability: The user interface should be simple and intuitive for both web and mobile clients.

System Design Diagrams

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