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What happens if a payment API gets called twice? 😳 Without idempotency, users could be charged multiple times 💀 In this video, we break down how idempotent payment APIs work and why they’re critical in real systems. You’ll learn: What idempotency means Preventing duplicate payments Idempotency keys explained Retry-safe API design Real-world payment system concepts Perfect for backend developers and system design interviews. #Backend #SystemDesign #API #DistributedSystems #Payments #TechExplained #Developer #Programming #CodingInterview #InterviewPrep #TechShorts