Tag · 2 pieces

#idempotency

GuideTechnology

19 min read

Design a Payment System: Idempotency, Ledgers and Reconciliation

Design the payment platform behind checkout and refunds, where correctness matters more than speed: payment intents and attempts, an explicit state machine, idempotency at every hop, asynchronous confirmation through verified webhooks, a double-entry ledger with a runnable example, reconciliation against provider reports, refunds, provider failover, fraud and PCI scope, and an audit trail.

GuideTechnology

17 min read

Idempotency, Retries and Message Delivery Guarantees

Retries are necessary in distributed systems, and they create duplicates. Learn what idempotency means, where duplicates come from, how to build idempotency keys correctly, unique constraints and idempotent consumers, which errors to retry, exponential backoff with jitter, retry amplification, and what at-most-once, at-least-once and effectively-once delivery really promise.

Tagged #idempotency

Design a Payment System: Idempotency, Ledgers and Reconciliation

Idempotency, Retries and Message Delivery Guarantees