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Security, auth & multi-tenancyHardSDE-3
A payments app sees accounts taken over via SIM-swap and social engineering, followed by quick money transfers. Design a risk-based authentication system that stops this without annoying normal users.
Asked at
CREDGooglePaytmPhonePe
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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