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API designHardSDE-3

Design the public API of a payment gateway like Razorpay or Stripe: how a merchant creates an order, collects payment, refunds, and learns the result.

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PaytmPhonePeRazorpayStripe

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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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Design a payment gateway for merchants (Razorpay) Lesson: Designing the API

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