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Scenarios & trade-offsHardStaff
After a 10-minute network issue between your checkout service and the payment provider, 3,000 customers were charged twice. You lead the postmortem. What most likely happened, how do you fix the customers, and what design changes stop it from happening again?
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CREDPhonePeRazorpayStripe
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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