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PCI-DSS applies to any system that stores, processes, or transmits cardholder data. The scope is contagious: any system in network range of card-data systems is also in scope. Scope reduction is the single biggest PCI cost lever. The pattern: tokenize at the entry point (Stripe.js, Plaid Auth, Braintree client SDK) so card numbers never enter your network. Your scope shrinks to 'we handle tokens' — far cheaper to audit.
Recommendation: never store raw PAN (primary account number). Use a tokenization provider (Stripe Elements, Adyen, Braintree, VGS) that captures the card client-side and gives you back a token. Your servers handle only the token. PCI scope drops from 'merchant level 1' (~1k/year).
[0-9]{13,19}). If any hit, that log is in scope. Add masking pre-log.Use these three in order. Each builds on the one before.
In one paragraph, explain PCI-DSS scope and scope reduction.
Walk me through tokenization at the network-architecture level.
Design a payments architecture that ends with merchant level 4 (smallest PCI scope).