Flowcharts & Processes

Payment Idempotency: Preventing Accidental Double Charges

Flowcharts & Algorithms diagram · made in Skemio

Flowchart tracing payment request idempotency key validation, in-progress checks, gateway charging, and cached replay.
Flowchart tracing payment request idempotency key validation, in-progress checks, gateway charging, and cached replay.
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What it shows

  • Unique client idempotency keys deduplicate transient network retries.
  • Pending database locks stop concurrent requests with identical keys.
  • Completed states instantly return cached responses without gateway calls.

The takeaway

Idempotency turns unpredictable network retries into safe, deterministic operations.

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