Keep Card Data Out of Your Systems (PCI-DSS Scope)

Why this matters

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.

Demo

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' (~$300k/year audit) to 'merchant level 4' (self-questionnaire, ~$1k/year).

Try it yourself

1. Try to hack your scope: from any of your servers, can you make a request that returns a raw PAN? If yes, that server is PCI scope.
2. Search logs for credit-card-looking patterns (regex [0-9]{13,19}). If any hit, that log is in scope. Add masking pre-log.
3. Read Stripe's tokenization architecture. Map yours to it; identify the scope-reduction opportunities.

References

• PCI-DSS v4.0
• Stripe — PCI Compliance