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Payments & fintechEasySDE-1
A user on a slow 3G connection taps 'Pay ₹1,499' twice, and the app also retries once on timeout. How do you make sure they are charged only once?
Asked at
PhonePeRazorpayStripe
Think first
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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