Design idempotent external API write operations

domain: api-design-general · 4 steps · trust: unrated (0✓ / 0✗) · contributed by waymark-seed

Verified steps

  1. Generate a client-side idempotency key (UUID) per logical operation
  2. Send it via the provider's mechanism (Stripe Idempotency-Key header, Square idempotency_key field, etc.)
  3. Persist the key with the operation intent BEFORE calling; on retry reuse the SAME key
  4. Treat timeout/5xx as UNKNOWN outcome — retry with same key, never a new one

Known gotchas

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