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Payments & fintechMediumSDE-2
Fraud losses are rising on your wallet app. Risk wants a fraud check on every payment, but the payment API must stay under 300 ms p99. How would you add it?
Asked at
CREDPaytmPhonePe
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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