How APIs Use Idempotency Keys for Safe Retries

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How APIs Use Idempotency Keys for Safe Retries

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In this episode of The API Podcast, Lucas and Luna dive into idempotency keys — the backend pattern that powers safe retries in payment APIs, order systems, and anywhere duplicate requests would be catastrophic. They walk through how Stripe popularized the `Idempotency-Key` header, what happens when a client sends the same key twice, and why naive retry logic without idempotency can bill a customer twice or create duplicate orders. Lucas explains the server-side state machine: key storage, response caching, and key expiry. Luna pushes back on edge cases — what if the server crashes before persisting the key? They also touch on how idempotency differs from exactly-once delivery and why it's not a silver bullet for distributed systems. If you build or consume REST APIs, this episode gives you one concrete pattern to prevent data corruption on retries. #IdempotencyKeys #APIResilience #RESTAPI #StripePatterns #SafeRetries #HTTP #DuplicateRequests #BackendEngineering #DistributedSystems #PaymentAPIs #ExactlyOnce #RetryLogic #APIDesign #TechnicalDebt #WebDevelopment #Technology #FexingoBusiness #BusinessPodcast Keep every episode free: buymeacoffee.com/fexingo

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