How Idempotency Keys Prevent Duplicate Payments

Have you ever wondered why clicking the Pay Now button twice doesn't result in being charged twice? In this video, we'll explore Idempotency Keys, one of the most important concepts in distributed systems and API design. Using a simple payment example, you'll learn: ✅ What an Idempotency Key is ✅ Why retries can be dangerous without it ✅ How systems prevent duplicate payments and transactions ✅ How servers handle network failures and safe retries ✅ Where this concept is used in real-world systems and cloud platforms Whether you're a Software Engineer, System Designer, Backend Developer, or preparing for System Design interviews, understanding idempotency is essential for building reliable and scalable systems. #SystemDesign #DistributedSystems #SoftwareEngineering #BackendDevelopment #API #Idempotency #Microservices #CloudComputing #Azure #TechExplained