Design a Payment System

Advanced · 30 min read · High-Level Design, Case Studies: Advanced

Ledgers, idempotency, PSP integration and reconciliation.

This is an Advanced lesson, part of Premium. What it covers:

• 1. Clarify the problem
• 2. Requirements
• 3. Capacity estimation
• 4. Key concepts
• 5. Data model
• 6. High-level design
• 7. Deep dives
• 8. Failure modes
• 9. Trade-offs summary
• 10. What interviewers look for
• Interview questions
• Practice
• Further reading

Previous: Design a Ticket Booking System · Next: Design an Ad Click Aggregator