# payment-gateway-integration

A skill for wiring Stripe, PayPal and Square into your backend: charges, subscriptions, webhooks. Useful when you build billing or a store.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · 524 installs · ★ 371
- Author: aj-geddes
- License: MIT · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/aj-geddes/useful-ai-prompts/tree/HEAD/skills/payment-gateway-integration/SKILL.md
- Updated: 2026-03-04
- HTML: https://affpapa.org/en/nevibecode/skills/payment-gateway-integration

## What it does

The skill walks through connecting payment gateways to a server: running transactions, managing subscriptions, handling webhooks and dealing with error cases. It ships a short Python example — Stripe config read from environment variables plus a service class that creates a PaymentIntent.

The bulk of it lives in `references/`: Stripe with Python/Flask, a Node.js/Express version, PayPal integration and subscription management. A separate section covers practices — verify webhook signatures, use idempotency keys, never store full card numbers, test in sandbox. Stripe keys come from the environment as `STRIPE_SECRET_KEY`, `STRIPE_PUBLISHABLE_KEY` and `STRIPE_WEBHOOK_SECRET`, so set those before you start.

The skill tells you not to trust client-side validation and not to ignore webhook events. Worth checking your own code on both counts, since that is where payments usually go missing.

## Requirements
- Works with: Stripe

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add aj-geddes/useful-ai-prompts --skill payment-gateway-integration -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/payment-gateway-integration/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/payment-gateway-integration/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add aj-geddes/useful-ai-prompts --skill payment-gateway-integration -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/payment-gateway-integration/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add aj-geddes/useful-ai-prompts --skill payment-gateway-integration -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/payment-gateway-integration/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install aj-geddes/useful-ai-prompts payment-gateway-integration
```

2. **Manually: put the files in place**
- File: `.github/skills/payment-gateway-integration/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add aj-geddes/useful-ai-prompts --skill payment-gateway-integration -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/aj-geddes/useful-ai-prompts --path skills/payment-gateway-integration
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/payment-gateway-integration/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add aj-geddes/useful-ai-prompts --skill payment-gateway-integration -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/aj-geddes/useful-ai-prompts/tree/HEAD/skills/payment-gateway-integration/SKILL.md

## When to use it
- charge a card through Stripe and update the order status
- set up recurring billing and renewals
- receive and verify a payment webhook
- handle a refund or a dispute
- add PayPal or Square to the same backend

## Example prompts
- wire Stripe into our Flask backend and create a PaymentIntent
- set up Stripe webhook handling with signature verification
- add subscriptions and recurring charges to our billing

## Source text · SKILL.md · MIT

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BEGIN THIRD-PARTY FILE 5981b340b923e64a
````text
---
name: payment-gateway-integration
description: >
  Integrate payment gateways like Stripe, PayPal, and Square with backends for
  payment processing, subscription management, and webhook handling. Use when
  building e-commerce platforms, implementing billing systems, and handling
  payments securely.
---

# Payment Gateway Integration

## Table of Contents

- [Overview](#overview)
- [When to Use](#when-to-use)
- [Quick Start](#quick-start)
- [Reference Guides](#reference-guides)
- [Best Practices](#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:

```python
# 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')

class StripePaymentService:
    @staticmethod
    def create_payment_intent(amount, currency='usd', description=None, metadata=None):
        """Create a payment intent"""
        try:
            intent = stripe.PaymentIntent.create(
                amount=int(amount * 100),  # Convert to cents
                currency=currency,
// ... (see reference guides for full implementation)
```

## Reference Guides

Detailed implementations in the `references/` directory:

| Guide | Contents |
|---|---|
| [Stripe Integration with Python/Flask](references/stripe-integration-with-pythonflask.md) | Stripe Integration with Python/Flask |
| [Node.js/Express Stripe Integration](references/nodejsexpress-stripe-integration.md) | Node.js/Express Stripe Integration |
| [PayPal Integration](references/paypal-integration.md) | PayPal Integration |
| [Subscription Management](references/subscription-management.md) | Subscription Management |

## Best Practices

### ✅ DO

- Use official payment SDK libraries
- Verify webhook signatures
- Store minimal payment information
- Never store full credit card numbers
- Use HTTPS for all payment routes
- Implement proper error handling
- Test with sandbox environments
````
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---
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