HardDesign: E-Commerce System (Amazon)

What is an idempotency key in payment processing?

— Tests your understanding of this concept.

Answer Options

AA key that encrypts payment data
BA unique identifier sent with payment request so retries don't cause duplicate charges
CA key that identifies the payment provider
DA key for PCI DSS compliance

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This question is from the Design: E-Commerce System (Amazon) topic (System Design Cases).

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