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Security, auth & multi-tenancyEasySDE-1
You are designing checkout for an Indian e-commerce app that wants to save customers' cards for one-click payments. How do you handle card data and encryption?
Asked at
FlipkartPaytmPhonePeRazorpay
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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