Design a Payment System — Idempotency, Reconciliation, and the Boring Discipline

Payment system design from first principles: ledger, idempotency keys, reconciliation against PSP, retries, and how to keep money straight at scale.

May 2, 2026 · 5 min · 906 words · Manvendra Rajpoot

Design a Payment System — Stripe-Style Architecture in 2026

Production-grade payment system design. Idempotency keys, double-entry ledger, async fulfillment, webhook handling, PCI scope, fraud rails, and the patterns Stripe-style products use.

April 30, 2026 · 4 min · 695 words · Manvendra Rajpoot