Skill2.1k repo starsupdated 2mo ago

payment-integration

This Claude Code skill enables production-ready payment processing across five major platforms: SePay for Vietnamese bank transfers and VietQR codes, Polar for global SaaS subscriptions with automated benefit delivery, Stripe for enterprise payments and Connect platforms, Paddle for merchant-of-record subscriptions with tax compliance, and Creem.io for licensing and revenue splits. Use it when implementing checkout flows, managing subscriptions and trials, handling payment webhooks, processing QR code payments, activating software licenses, or managing multi-provider orders and commission structures.

View source Repository: claudekit-skills

Install in Claude Code

Copy

git clone --depth 1 https://github.com/mrgoonie/claudekit-skills /tmp/payment-integration && cp -r /tmp/payment-integration/.claude/skills/payment-integration ~/.claude/skills/payment-integration

Then start a new Claude Code session; the skill loads automatically.

Definition

SKILL.md

# Payment Integration

Production-proven payment processing with SePay (Vietnamese banks), Polar (global SaaS), Stripe (global infrastructure), Paddle (MoR subscriptions), and Creem.io (MoR + licensing).

## When to Use

- Payment gateway integration (checkout, processing)
- Subscription management (trials, upgrades, billing)
- Webhook handling (notifications, idempotency)
- QR code payments (VietQR, NAPAS)
- Software licensing (device activation)
- Multi-provider order management
- Revenue splits and commissions

## Platform Selection

| Platform | Best For |
|----------|----------|
| **SePay** | Vietnamese market, VND, bank transfers, VietQR |
| **Polar** | Global SaaS, subscriptions, automated benefits (GitHub/Discord) |
| **Stripe** | Enterprise payments, Connect platforms, custom checkout |
| **Paddle** | MoR subscriptions, global tax compliance, churn prevention |
| **Creem.io** | MoR + licensing, revenue splits, no-code checkout |

## Quick Reference

### SePay
- `references/sepay/overview.md` - Auth, supported banks
- `references/sepay/api.md` - Endpoints, transactions
- `references/sepay/webhooks.md` - Setup, verification
- `references/sepay/sdk.md` - Node.js, PHP, Laravel
- `references/sepay/qr-codes.md` - VietQR generation
- `references/sepay/best-practices.md` - Production patterns

### Polar
- `references/polar/overview.md` - Auth, MoR concept
- `references/polar/products.md` - Pricing models
- `references/polar/checkouts.md` - Checkout flows
- `references/polar/subscriptions.md` - Lifecycle management
- `references/polar/webhooks.md` - Event handling
- `references/polar/benefits.md` - Automated delivery
- `references/polar/sdk.md` - Multi-language SDKs
- `references/polar/best-practices.md` - Production patterns

### Stripe
- `references/stripe/stripe-best-practices.md` - Integration design
- `references/stripe/stripe-sdks.md` - Server SDKs
- `references/stripe/stripe-js.md` - Payment Element
- `references/stripe/stripe-cli.md` - Local testing
- `references/stripe/stripe-upgrade.md` - Version upgrades
- External: https://docs.stripe.com/llms.txt

### Paddle
- `references/paddle/overview.md` - MoR, auth, entity IDs
- `references/paddle/api.md` - Products, prices, transactions
- `references/paddle/paddle-js.md` - Checkout overlay/inline
- `references/paddle/subscriptions.md` - Trials, upgrades, pause
- `references/paddle/webhooks.md` - SHA256 verification
- `references/paddle/sdk.md` - Node, Python, PHP, Go
- `references/paddle/best-practices.md` - Production patterns
- External: https://developer.paddle.com/llms.txt

### Creem.io
- `references/creem/overview.md` - MoR, auth, global support
- `references/creem/api.md` - Products, checkout sessions
- `references/creem/checkouts.md` - No-code links, storefronts
- `references/creem/subscriptions.md` - Trials, seat-based
- `references/creem/licensing.md` - Device activation
- `references/creem/webhooks.md` - Signature verification
- `references/creem/sdk.md` - Next.js, Better Auth
- External: https://docs.creem.io/llms.txt

### Multi-Provider
- `references/multi-provider-order-management-patterns.md` - Unified orders, currency conversion

### Scripts
- `scripts/sepay-webhook-verify.js` - SePay webhook verification
- `scripts/polar-webhook-verify.js` - Polar webhook verification
- `scripts/checkout-helper.js` - Checkout session generator

## Key Capabilities

| Platform | Highlights |
|----------|------------|
| **SePay** | QR/bank/cards, 44+ VN banks, webhooks, 2 req/s |
| **Polar** | MoR, subscriptions, usage billing, benefits, 300 req/min |
| **Stripe** | CheckoutSessions, Billing, Connect, Payment Element |
| **Paddle** | MoR, overlay/inline checkout, Retain (churn prevention), tax |
| **Creem.io** | MoR, licensing, revenue splits, no-code checkout |

## Implementation

See `references/implementation-workflows.md` for step-by-step guides per platform.

**General flow:** auth → products → checkout → webhooks → events

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