PCI DSS Compliance

PCI DSS (Payment Card Industry Data Security Standard) is a set of security requirements that any organization handling credit card data must follow. The standard defines four compliance levels based on transaction volume, with most SaaS applications falling under Level 4 (fewer than 20,000 e-commerce transactions per year). By using Stripe.js or Stripe Elements, which collect card data in secure iframes hosted on Stripe's domain, your servers never touch raw card numbers. This qualifies you for SAQ-A (Self-Assessment Questionnaire A), the simplest compliance tier, because cardholder data never passes through your infrastructure.

Maintaining SAQ-A eligibility requires strict discipline in your frontend integration. Card data must only be collected through Stripe's client-side libraries, never through your own form inputs. You must serve your payment pages over HTTPS, you cannot log or store any part of a card number (not even the last four digits from your own forms, though you can store them from Stripe's API responses), and your Content Security Policy headers should restrict script sources to prevent JavaScript injection that could skim card data. Server-side, you work exclusively with payment tokens, PaymentMethod IDs (pm_...), and Customer IDs rather than raw card details.

Companies that choose to handle card data directly (e.g., building a custom card vault) must comply with the full PCI DSS standard, which involves hundreds of security controls, quarterly network scans by an Approved Scanning Vendor (ASV), and potentially an on-site audit by a Qualified Security Assessor (QSA). This is extremely costly and operationally burdensome. The overwhelming best practice is to delegate card handling entirely to a PCI Level 1 certified provider like Stripe and maintain your SAQ-A compliance with minimal overhead.