During Integrating Razorpay Payment Gateway Payment is not happening?

Try to run this Code:

 @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() {
    super.dispose();
    _razorpay.clear();
  }

  void openCheckout() async {
    var options = {
      'key': 'rzp_test_1DP5mmOlF5G5ag',
      'amount': 2000,
      'name': 'Acme Corp.',
      'description': 'Fine T-Shirt',
      'prefill': {'contact': '8888888888', 'email': 'test@razorpay.com'},
      'external': {
        'wallets': ['paytm']
      }
    };

    try {
      _razorpay.open(options);
    } catch (e) {
      debugPrint(e);
    }
  }

  void _handlePaymentSuccess(PaymentSuccessResponse response) {
    Fluttertoast.showToast(
        msg: "SUCCESS: " + response.paymentId, timeInSecForIos: 4);
  }

  void _handlePaymentError(PaymentFailureResponse response) {
    Fluttertoast.showToast(
        msg: "ERROR: " + response.code.toString() + " - " + response.message,
        timeInSecForIos: 4);
  }

  void _handleExternalWallet(ExternalWalletResponse response) {
    Fluttertoast.showToast(
        msg: "EXTERNAL_WALLET: " + response.walletName, timeInSecForIos: 4);
  }

The above error occurs when your provided money is not in correct format. RazorPay accepts money only in paise, therefore if you provide money in decimal format(i.e double) or any value less than 100 then it will throw that error. So if you have any decimal value try converting it as integer paise. I'm attaching a small code as well for reference.

 RegExp regex = RegExp(r"([.]*0)(?!.*\d)");
 double money = double.parse(widget.totalMoney);
    double tMoney = money*100;
    String stringMoney = tMoney.toString().replaceAll(regex, '');
    int totalMoney = int.parse(stringMoney);

The regular expression will remove zero after the decimal from stringMoney. Or directly converting it into string will also do the same.

Hope this will help :)

It might be an issue of mismatched Key IDs and Key secrets. Try double checking to see if the code has a consistent Key ID and Key secret. Especially in case you have switched over from a test account to a live account.

Please re-check that your API key is valid. It's due to an error in your API key or secret code.