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Payments & fintechEasySDE-1
Your wallet service stores each user's balance in a single 'balance' column and updates it on every transaction. Why would a payments team push back, and what would you build instead?
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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