https://blog.coffeecoded.dev/tech/ Recent content in Tech on Coffee Coded Hugo en Sat, 18 May 2024 00:00:00 +0000 https://blog.coffeecoded.dev/tech/idempotency-keys-spring-boot/ Sat, 18 May 2024 00:00:00 +0000 https://blog.coffeecoded.dev/tech/idempotency-keys-spring-boot/ <p>When integrating with external systems like Stripe or PayPal, you typically rely on webhooks to be notified of events. However, distributed systems guarantee <em>at-least-once</em> delivery, meaning your application might receive the exact same webhook event multiple times.</p> <p>If your webhook handler creates a payment record or provisions a resource, processing the same event twice can lead to severe bugs—like double-charging a customer.</p> <p>This is where <strong>idempotency</strong> comes in. An idempotent operation is one that produces the same result regardless of how many times it is executed.</p>