Agent-Skills.md

Agent Skills: Payment Integration

Implement payment integrations with SePay (Vietnamese payment gateway with VietQR, bank transfers, cards) and Polar (global SaaS monetization platform with subscriptions, usage-based billing, automated benefits). Use when integrating payment processing, implementing checkout flows, managing subscriptions, handling webhooks, processing bank transfers, generating QR codes, automating benefit delivery, or building billing systems. Supports authentication (API keys, OAuth2), product management, customer portals, tax compliance (Polar as MoR), and comprehensive SDK integrations (Node.js, PHP, Python, Go, Laravel, Next.js).

UncategorizedID: binjuhor/shadcn-lar/payment-integration

Repository

binjuhor/shadcn-lar
binjuhor
6019

Install this agent skill to your local

pnpm dlx add-skill https://github.com/binjuhor/shadcn-lar/tree/HEAD/.claude/skills/payment-integration

Skill Files

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.claude/skills/payment-integration/SKILL.md

Skill Metadata

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

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