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Consistency & distributed transactionsHardSDE-2
Your app calls the bank or NPCI switch to debit a user for a UPI payment, and the call times out. The money may or may not have moved. What does your system do?
Asked at
CREDGrowwPaytmPhonePeRazorpay
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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