HardDesign: Payment System (Stripe/PayPal)

What is an idempotency key in payment processing?

Tests your understanding of this concept.

Answer Options

AA key that encrypts payment data
BA unique client-generated ID sent with each payment request to ensure retries don't cause duplicate charges
CA key for PCI DSS tokenization
DA key that identifies the payment gateway

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This question is from the Design: Payment System (Stripe/PayPal) topic (System Design Cases).

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