Payment Gateway Integration

This handles the standard payment gateway integrations you need for e-commerce: Stripe, PayPal, and Square. It covers payment intents, subscription billing, webhook verification, and refund handling across Python/Flask and Node.js/Express backends. The reference guides include actual working code for creating payment intents, managing subscriptions, and properly verifying webhook signatures. Best practices emphasize the obvious security stuff like never storing raw card data and always verifying webhooks, but also practical details like using idempotency keys and testing in sandbox mode first. If you're building anything that takes money online, this gives you the boilerplate to start processing payments without making the common security mistakes.

skills.sh installs: 529
GitHub stars: 379
last updated: Aug 21, 2026

View on GitHub

Install

$ npx -y skills add aj-geddes/useful-ai-prompts --skill payment-gateway-integration --agent claude-code

Installs into .claude/skills of the current project.

Files

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:

# config.py
import os

class StripeConfig:
    STRIPE_SECRET_KEY = os.getenv('STRIPE_SECRET_KEY')
    STRIPE_PUBLISHABLE_KEY = os.getenv('STRIPE_PUBLISHABLE_KEY')
    STRIPE_WEBHOOK_SECRET = os.getenv('STRIPE_WEBHOOK_SECRET')

# stripe_service.py
import stripe
from datetime import datetime, timedelta
import logging

logger = logging.getLogger(__name__)

stripe.api_key = os.getenv('STRIPE_SECRET_KEY')

SKILL.md on GitHub