Payment Integration

Integrate payments with SePay (VietQR), Polar, Stripe, Paddle (MoR subscriptions), Creem.io (licensing). Checkout, webhooks, subscriptions, QR codes, multi-provider orders.

tools-only c92dfc3 3 files · 9.2 KB Updated Sep 9, 2026 7 repo stars

Integrations & APIs

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$ npx skillmds add tools-only/payment-integration

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Makes network calls
The instructions fetch remote URLs or call external services.

License: MIT
Works with: Claude Code Claude.ai OpenAI Codex +

File contents

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

---name: payment-integrationdescription: Integrate payments with SePay (VietQR), Polar, Stripe, Paddle (MoR subscriptions), Creem.io (licensing). Checkout, webhooks, subscriptions, QR codes, multi-provider orders.license: MIT--- # 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

tools-only/X-Skills/tree/main/commercial/181-payment-integration_1e00f6b4 commit c92dfc39d9

Frequently asked questions

npx skillmds add tools-only/payment-integration