#main.dart

import 'package:flutter/material.dart';
import 'package:razorpay/razorpay.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Razorpay Integration',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const RazorPayIntegration(),
    );
  }
}

razorpay.dart

import 'package:flutter/material.dart';
import 'package:fluttertoast/fluttertoast.dart';
import 'package:razorpay_flutter/razorpay_flutter.dart';

class RazorPayIntegration extends StatefulWidget {
  const RazorPayIntegration({Key? key}) : super(key: key);

  @override
  _RazorPayIntegrationState createState() => _RazorPayIntegrationState();
}

class _RazorPayIntegrationState extends State<RazorPayIntegration> {
  late Razorpay razorpay;
  final TextEditingController amountController = TextEditingController();

  @override
  void initState() {
    super.initState();
    razorpay = Razorpay();
    razorpay.on(Razorpay.EVENT_PAYMENT_SUCCESS, handlePaymentSuccess);
    razorpay.on(Razorpay.EVENT_PAYMENT_ERROR, handlePaymentError);
    razorpay.on(Razorpay.EVENT_EXTERNAL_WALLET, handleExternalWallet);
  }

  @override
  void dispose() {
    razorpay.clear();
    amountController.dispose();
    super.dispose();
  }

  void handlePaymentSuccess(PaymentSuccessResponse response) {
    Fluttertoast.showToast(msg: "Payment Successful");
    print("Payment ID: ${response.paymentId}");
  }

  void handlePaymentError(PaymentFailureResponse response) {
    Fluttertoast.showToast(msg: "Payment Failed");
    print("Error: ${response.message}");
  }

  void handleExternalWallet(ExternalWalletResponse response) {
    Fluttertoast.showToast(msg: "External Wallet Selected");
  }

  void openCheckout() {
    var options = {
      'key': 'Your-Key',
      'amount': int.parse(amountController.text) * 100, // Convert to paisa
      'name': 'Riya Tyagi',
      'description': 'Payment',
      'timeout': 300,
      'prefill': {
        'contact': '7409616828',
        'email': 'riya@razorpay.com'
      },
      'external': {
        'wallets': ['paytm']
      }
    };

    try {
      razorpay.open(options);
    } catch (e) {
      debugPrint("Error: ${e.toString()}");
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Padding(
              padding: const EdgeInsets.all(20.0),
              child: TextField(
                controller: amountController,
                keyboardType: TextInputType.number,
                decoration: const InputDecoration(
                  hintText: "Enter the amount you want to pay",
                ),
              ),
            ),
            const SizedBox(height: 50),
            ElevatedButton(
              onPressed: openCheckout,
              child: const Text("Pay Now"),
            ),
          ],
        ),
      ),
    );
  }
}