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Messaging & event-driven designEasySDE-1
Your app receives payment webhooks from Razorpay. Sometimes the same webhook arrives twice, and sometimes your handler is slow and the provider retries. How do you design the receiver?
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CREDRazorpayStripeZomato
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Answer out loud as you would in the room — clarify, give numbers, name the trade-off — then compare with the model answer.
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