pay_mechanic.dart

  processTransaction(context) async {
    var initializer = RavePayInitializer(
        amount: double.parse(amountController.text),
        publicKey: ravePublicKey,
        encryptionKey: raveEncryptKey)
      ..country = "NG"
      ..currency = "NGN"
      ..email = mEmail
      ..fName = mName
      ..lName = "lName"
      ..narration = "FABAT MANAGEMENT"
      ..txRef = "SCH${DateTime.now().millisecondsSinceEpoch}"
      ..acceptAccountPayments = false
      ..acceptCardPayments = true
      ..acceptAchPayments = false
      ..acceptGHMobileMoneyPayments = false
      ..acceptUgMobileMoneyPayments = false
      ..staging = false
      ..isPreAuth = true
      ..displayFee = true;

    RavePayManager()
        .prompt(context: context, initializer: initializer)
        .then((result) {
      Toast.show("err", context,
          gravity: Toast.TOP, duration: Toast.LENGTH_LONG);

      if (result.status == RaveStatus.success) {
        doAfterSuccess(result.message);
      } else if (result.status == RaveStatus.cancelled) {
        if (mounted) {
          scaffoldKey.currentState.showSnackBar(
            SnackBar(
              content: Text(
                "Closed!",
                style: TextStyle(color: Colors.white, fontSize: 18),
              ),
              backgroundColor: primaryColor,
              duration: Duration(seconds: 3),
            ),
          );
        }
      } else if (result.status == RaveStatus.error) {
        showDialog(
            context: context,
            builder: (_) {
              return AlertDialog(
                title: Text(
                  "Error",
                  textAlign: TextAlign.center,
                  style: TextStyle(color: Colors.red, fontSize: 20),
                ),
                content: Text(
                  "An error has occured ",
                  textAlign: TextAlign.center,
                  style: TextStyle(fontSize: 18),
                ),
              );
            });
      }

      print(result);
    });
  }