
payment-integration
Integrate payments with SePay (VietQR), Polar, Stripe, Paddle (MoR subscriptions), Creem.io (licensing). Checkout, webhooks, subscriptions, QR codes, multi-provider orders.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/unclecatvn/agent-skills --skill payment-integration- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads payment-integration automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
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 banksreferences/sepay/api.md- Endpoints, transactionsreferences/sepay/webhooks.md- Setup, verificationreferences/sepay/sdk.md- Node.js, PHP, Laravelreferences/sepay/qr-codes.md- VietQR generationreferences/sepay/best-practices.md- Production patterns
Polar
references/polar/overview.md- Auth, MoR conceptreferences/polar/products.md- Pricing modelsreferences/polar/checkouts.md- Checkout flowsreferences/polar/subscriptions.md- Lifecycle managementreferences/polar/webhooks.md- Event handlingreferences/polar/benefits.md- Automated deliveryreferences/polar/sdk.md- Multi-language SDKsreferences/polar/best-practices.md- Production patterns
Stripe
references/stripe/stripe-best-practices.md- Integration designreferences/stripe/stripe-sdks.md- Server SDKsreferences/stripe/stripe-js.md- Payment Elementreferences/stripe/stripe-cli.md- Local testingreferences/stripe/stripe-upgrade.md- Version upgrades- External: https://docs.stripe.com/llms.txt
Paddle
references/paddle/overview.md- MoR, auth, entity IDsreferences/paddle/api.md- Products, prices, transactionsreferences/paddle/paddle-js.md- Checkout overlay/inlinereferences/paddle/subscriptions.md- Trials, upgrades, pausereferences/paddle/webhooks.md- SHA256 verificationreferences/paddle/sdk.md- Node, Python, PHP, Goreferences/paddle/best-practices.md- Production patterns- External: https://developer.paddle.com/llms.txt
Creem.io
references/creem/overview.md- MoR, auth, global supportreferences/creem/api.md- Products, checkout sessionsreferences/creem/checkouts.md- No-code links, storefrontsreferences/creem/subscriptions.md- Trials, seat-basedreferences/creem/licensing.md- Device activationreferences/creem/webhooks.md- Signature verificationreferences/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 verificationscripts/polar-webhook-verify.js- Polar webhook verificationscripts/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
FAQ
What does the payment-integration skill do?
Integrate payments with SePay (VietQR), Polar, Stripe, Paddle (MoR subscriptions), Creem.io (licensing). Checkout, webhooks, subscriptions, QR codes, multi-provider orders.
How do I install payment-integration?
Run npx skills add https://github.com/unclecatvn/agent-skills --skill payment-integration in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/payment-integration/ (personal) or .claude/skills/payment-integration/ (project).
Which AI agents can use payment-integration?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is payment-integration safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains payment-integration?
It is published by unclecatvn in unclecatvn/agent-skills. It has 213 recorded installs.
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