Integrate payments with SePay (VietQR), Polar, Stripe, Paddle, or Creem.io. Use for checkout flows, subscription management, webhook handling, QR code payments, and software licensing.
Payment Integration
Production payment processing across SePay, Polar, Stripe, Paddle, and Creem.io.
When to Use
Setting up payment gateway checkout or processing
Building subscription management (trials, upgrades, billing)
Handling webhooks with idempotency
Implementing QR code payments (VietQR/NAPAS)
Software licensing with device activation
Multi-provider order management
Don't Use When
Simple donation buttons (use Ko-fi or Buy Me a Coffee embed)
Internal transfer tools without customer-facing payments
Platform Selection
Platform
Best For
SePay
Vietnamese market, VND, bank transfers, VietQR
Polar
Global SaaS, subscriptions, automated benefits
Stripe
Enterprise, Connect platforms, custom checkout
Paddle
MoR subscriptions, global tax compliance
Creem.io
MoR + licensing, revenue splits, no-code checkout
General Integration Flow
auth → products → checkout → webhooks → events
Key Capabilities
Platform
Rate Limit
Highlights
SePay
2 req/s
QR/bank/cards, 44+ VN banks
Polar
300 req/min
MoR, usage billing, GitHub/Discord benefits
Stripe
varies
CheckoutSessions, Billing, Connect, Payment Element
Paddle
varies
MoR overlay/inline, Retain churn prevention, tax
Creem.io
varies
MoR, device licensing, revenue splits
Security Rules
Store all API keys in environment variables — never hardcode
Always verify webhook signatures before processing events
Use idempotency keys for checkout and subscription operations
Implement proper session token handling for embedded flows
