Payments & PCI DSS
Card payment mechanics and the rules around cardholder data — auth vs capture, void vs refund, 3DS liability, reconciliation, tokenisation and PCI scope.
Twenty questions on card payments and the rules around cardholder data: the difference between authorizing and capturing, when a void beats a refund, what PCI DSS actually forbids you from keeping, how tokenisation shrinks scope, and why money never belongs in a floating-point type.
You get a score at the end, not a breakdown.
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