Payment Gateway Integration for Web3 & Fintech: Stripe, Crypto & Hybrid Solutions
Muhammad Zain
TelGates Team
Modern fintech applications need to handle both fiat and crypto payments seamlessly. Here's how to build robust payment infrastructure.
Fiat Payment Integration
Stripe remains the gold standard: - Checkout Sessions for one-time payments - Subscriptions API for recurring billing - Connect for marketplace payments - 3D Secure for PSD2 compliance - Webhook-driven architecture for reliability
Crypto Payment Integration
On-chain payments: - Accept ETH, USDC, USDT directly to smart contracts - Use Chainlink price feeds for real-time conversion - Implement payment verification with event listeners
Crypto on-ramps: - MoonPay, Transak, or Wyre for fiat-to-crypto - Widget-based integration (2-3 days) - KYC handled by the on-ramp provider
Hybrid Checkout Flow
Our recommended pattern: 1. User selects product/service 2. Checkout page offers "Pay with Card" or "Pay with Crypto" 3. Card → Stripe Checkout Session 4. Crypto → Smart contract payment with automatic confirmation 5. Both paths trigger the same fulfillment webhook
Security Best Practices
- Never handle raw card data (use Stripe Elements)
- Verify webhook signatures server-side
- Implement idempotency keys for payment retries
- Monitor for fraud with Stripe Radar rules
Development Timeline
- Stripe-only: 1-2 weeks
- Crypto-only: 2-3 weeks
- Hybrid (fiat + crypto): 3-5 weeks
TelGates specializes in building hybrid payment systems for fintech and Web3 applications.