fix: fixed card and bank transaction bugs

Author: wilburx9

example/lib/main.dart

@@ -36,7 +36,7 @@ class HomePage extends StatefulWidget {
 }
 
 class _HomePageState extends State<HomePage> {
-  final _scaffoldKey = new GlobalKey<ScaffoldMessengerState>();
+  final _scaffoldKey = new GlobalKey<ScaffoldState>();
   final _formKey = GlobalKey<FormState>();
   final _verticalSizeBox = const SizedBox(height: 20.0);
   final _horizontalSizeBox = const SizedBox(width: 10.0);
@@ -437,12 +437,13 @@ class _HomePageState extends State<HomePage> {
 
   _showMessage(String message,
       [Duration duration = const Duration(seconds: 4)]) {
-    _scaffoldKey.currentState?.showSnackBar(new SnackBar(
+    ScaffoldMessenger.of(context).showSnackBar(new SnackBar(
       content: new Text(message),
       duration: duration,
       action: new SnackBarAction(
           label: 'CLOSE',
-          onPressed: () => _scaffoldKey.currentState?.removeCurrentSnackBar()),
+          onPressed: () =>
+              ScaffoldMessenger.of(context).removeCurrentSnackBar()),
     ));
   }
 

lib/src/api/request/bank_charge_request_body.dart

@@ -19,7 +19,7 @@ class BankChargeRequestBody extends BaseRequestBody {
   Map<String, String?> paramsMap() {
     var map = {fieldDevice: device, 'account_number': account.number};
     map['birthday'] = _birthday;
-    return map;
+    return map..removeWhere((key, value) => value == null || value.isEmpty);
   }
 
   set token(String value) => _token = value;

lib/src/transaction/base_transaction_manager.dart

@@ -23,7 +23,11 @@ abstract class BaseTransactionManager {
   final Transaction transaction = Transaction();
   final String publicKey;
 
-  BaseTransactionManager({required this.charge, required this.context, required this.publicKey});
+  BaseTransactionManager({
+    required this.charge,
+    required this.context,
+    required this.publicKey,
+  });
 
   initiate() async {
     if (processing) throw ProcessingException();
@@ -120,15 +124,17 @@ abstract class BaseTransactionManager {
   }
 
   Future<CheckoutResponse> getAuthFrmUI(String? url) async {
-    String result =
-        await (Utils.methodChannel.invokeMethod('getAuthorization', {"authUrl": url})
-            as FutureOr<String>);
-    TransactionApiResponse apiResponse;
-    try {
-      Map<String, dynamic> responseMap = json.decode(result);
-      apiResponse = TransactionApiResponse.fromMap(responseMap);
-    } catch (e) {
-      apiResponse = TransactionApiResponse.unknownServerResponse();
+    TransactionApiResponse apiResponse =
+        TransactionApiResponse.unknownServerResponse();
+
+    String? result = await Utils.methodChannel
+        .invokeMethod<String>('getAuthorization', {"authUrl": url});
+
+    if (result != null) {
+      try {
+        Map<String, dynamic> responseMap = json.decode(result);
+        apiResponse = TransactionApiResponse.fromMap(responseMap);
+      } catch (e) {}
     }
     return _initApiResponse(apiResponse);
   }

lib/src/transaction/card_transaction_manager.dart

@@ -72,10 +72,10 @@ class CardTransactionManager extends BaseTransactionManager {
     }
   }
 
-  _validateChargeOnServer() {
+  Future<CheckoutResponse> _validateChargeOnServer() {
     Map<String, String?> params = validateRequestBody.paramsMap();
     Future<TransactionApiResponse> future = service.validateCharge(params);
-    handleServerResponse(future);
+    return handleServerResponse(future);
   }
 
   Future<CheckoutResponse> _reQueryChargeOnServer() {

lib/src/widgets/checkout/checkout_widget.dart

@@ -141,20 +141,24 @@ class _CheckoutWidgetState extends BaseState<CheckoutWidget>
       title: _buildTitle(),
       content: new Container(
         child: new SingleChildScrollView(
-          child: new Container(
-              padding:
-                  const EdgeInsets.symmetric(vertical: 10.0, horizontal: 10.0),
-              child: Column(
-                children: <Widget>[
-                  _showProcessingError()
-                      ? _buildErrorWidget()
-                      : _paymentSuccessful
-                          ? _buildSuccessfulWidget()
-                          : _methodWidgets[_currentIndex!].child,
-                  SizedBox(height: 20),
-                  securedWidget
-                ],
-              )),
+          child: GestureDetector(
+            onTap: () => FocusScope.of(context).unfocus(),
+            behavior: HitTestBehavior.translucent,
+            child: new Container(
+                padding: const EdgeInsets.symmetric(
+                    vertical: 10.0, horizontal: 10.0),
+                child: Column(
+                  children: <Widget>[
+                    _showProcessingError()
+                        ? _buildErrorWidget()
+                        : _paymentSuccessful
+                            ? _buildSuccessfulWidget()
+                            : _methodWidgets[_currentIndex!].child,
+                    SizedBox(height: 20),
+                    securedWidget
+                  ],
+                )),
+          ),
         ),
       ),
     );
@@ -334,6 +338,7 @@ class _CheckoutWidgetState extends BaseState<CheckoutWidget>
 
   void _onPaymentResponse(CheckoutResponse response) {
     _response = response;
+    if (!mounted) return;
     if (response.status == true) {
       _onPaymentSuccess();
     } else {