Why Razorpay Is the Default Choice for Indian Flutter Apps
For apps targeting Indian users, Razorpay is almost always the right payment gateway choice. It supports every Indian payment method — UPI (the dominant payment mode), cards, net banking, wallets, and BNPL — with a single SDK integration. Its Flutter SDK is well-maintained and the dashboard provides excellent analytics and settlement management.
Architecture: Why You Need a Backend Server
A critical point most Flutter payment tutorials get wrong: you cannot create Razorpay orders or verify payments from client-side Flutter code. Your Razorpay API secret must never be in the app binary. The correct architecture: Flutter app calls YOUR backend to create an order → backend calls Razorpay API with the secret key and returns the order ID → Flutter opens Razorpay checkout → Razorpay processes payment and returns a payment ID and signature → Flutter sends these to YOUR backend for cryptographic verification → backend marks the order as paid in your database.
At DevXAI Technologies, all steps involving the Razorpay secret key run exclusively on Firebase Cloud Functions with the key stored as an environment variable — never in the Flutter app binary.
Common Mistakes and How to Avoid Them
- Putting the API secret in Flutter: Never. Use Cloud Functions or any backend server.
- Skipping signature verification: Without this, anyone can fake a payment success response. Always verify the HMAC-SHA256 signature on the server.
- Using test keys in production: Razorpay test keys start with
rzp_test_; live keys start withrzp_live_. Double-check before going live. - Not handling webhooks for subscriptions: For recurring payments and refunds, rely on Razorpay webhooks (server-to-server) rather than client callbacks — webhooks are more reliable when the user closes the app mid-payment.
We handle payment integrations as part of every e-commerce or subscription app we build at DevXAI Technologies. Contact us at hello@devxaitechnologies.com if you need help getting this right.