doPayment method

Future<Map?> doPayment(Map<String, dynamic> inputParams)

WEB

Implementation

Future<Map<dynamic, dynamic>?> doPayment(Map<String, dynamic> inputParams) async {

  var window = html.window;
  var document = window.document;

  /// FORM
  var my_form = document.createElement('FORM') as FormElement ;
  my_form.id = 'redirectForm';
  my_form.method = 'POST';
  my_form.target = 'POPUPW';

  String URL = "";
  if(inputParams["stage"].toString().toUpperCase() == "TEST") {
    URL = 'https://test.cashfree.com/billpay/checkout/post/submit';
  } else {
    URL = 'https://www.cashfree.com/checkout/post/submit';
  }

  my_form.action = URL;

  /// Adding source
  inputParams["source"] = "flutter-hyb";

  /// Adding all form paramters
  inputParams.forEach((key, value) {
    var my_tb = document.createElement('INPUT') as InputElement;
    my_tb.type = 'HIDDEN';
    my_tb.name = key;
    my_tb.value = value;
    my_form.children.add(my_tb);
  });

  document.querySelector("body")?.children.add(my_form);
  var paymentWindow = window.open('about:blank', 'POPUPW');

  /// Form Submit
  my_form.submit();

  /// Timer
  Timer.periodic(Duration(milliseconds: 500), (timer) {
    if(paymentWindow.closed == true) {
      timer.cancel();
      var cancelledResponse = {
        "txStatus": "CANCELLED",
        "txMsg": "transaction cancelled by the user",
        "orderId": inputParams["orderId"]
      };
      window.postMessage(cancelledResponse, "*");
    }
  });

  /// Awaiting for first message
  var response = await window.onMessage.first;

  /// Closing the window
  paymentWindow.close();

  /// Sending back the response
  if(response.data is String) {
    var completer = new Completer<Map<dynamic, dynamic>>();
    var r = jsonDecode(response.data);
    completer.complete(r);
    return completer.future;
  } else {
    var completer = new Completer<Map<dynamic, dynamic>>();
    completer.complete(response.data);
    return completer.future;
  }
}