Payment Integration Principles

Guidelines for building secure, compliant payment systems.

When to Invoke

• Integrating payment gateways (Stripe, Adyen, etc.)
• PCI compliance requirements
• Subscription/billing system design
• Fraud prevention implementation

Security (Non-Negotiable)

PCI DSS Compliance

1. Never store raw card data — use tokenization via gateway.
2. Never log payment credentials — mask card numbers, CVV never stored.
3. TLS everywhere — all payment communication over HTTPS.
4. Minimal data retention — store only what's legally required.