Hard Design: E-Commerce System (Amazon)

What is an idempotency key in payment processing?

— Tests your understanding of this concept.

Answer Options

A A key that encrypts payment data

B A unique identifier sent with payment request so retries don't cause duplicate charges

C A key that identifies the payment provider

D A 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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