Grokking the System Design Interview, Volume II
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Payment System: Requirements

Step 2: Requirements Clarification

Functional Requirements

  • Payment Processing (Authorization & Capture): The core functionality is to process a payment transaction. The system should accept a payment request (e.g., an API call to charge a customer’s card for a certain amount) and handle the entire authorization flow. This involves validating the request, performing fraud checks, communicating with the external payment network (acquirer/issuer), and returning the result (approved or declined) to the merchant

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