Billing

A comprehensive guide for implementing Stripe payment processing in web applications. Covers one-time payments, subscription billing, webhook handling, customer management, refunds, and testing patterns with production-ready code examples following PCI compliance best practices.

A comprehensive reference guide for building automated billing systems including subscription lifecycle management, invoice generation, dunning workflows for failed payment recovery, proration calculations, and tax/VAT/GST handling. Provides Python code templates and best practices for SaaS billing implementation.

This skill provides comprehensive guidance for integrating PayPal payment processing into applications. It covers Express Checkout with Smart Payment Buttons, IPN (webhook) handling for payment notifications, recurring billing/subscriptions, and refund workflows with production-ready Python code examples.