"Why Your Retry Logic Is Silently Charging Customers Twice"

Short summary

Duplicate payment charges from retries can be prevented with the idempotency-key pattern used by Stripe and Adyen. This requires per-key locks, double-check logic, and configurable response caching to handle edge cases. Complete Go implementation example provided.

• •Idempotency-key header prevents duplicate side effects from client retries
• •Per-key locks with double-check pattern prevents thundering herd race conditions
• •Configurable caching strategy and request validation handle edge cases

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