Payment Gateway Integration Table of Contents - Overview - When to Use - Quick Start - Reference Guides - Best Practices Overview Build secure payment processing systems with major payment providers (Stripe, PayPal, Square), handling transactions, subscriptions, webhooks, PCI compliance, and error scenarios across different backend frameworks. When to Use - Processing customer payments - Implementing subscription billing - Building e-commerce platforms - Handling refunds and disputes - Managing recurring charges - Integrating payment webhooks Quick Start Minimal working example: Reference Gui…