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Idempotency, retries & failure handlingHardSDE-3
You run a bill-payment app on UPI. About 0.5% of transactions end in 'pending' or 'deemed' status, and users complain that money left their account but the bill was not paid. Design how you resolve these reliably.
Asked at
CREDPaytmPhonePeRazorpay
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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