fixed error on payment

lib/src/logic/provider/addTocart_provider.dart

@@ -156,6 +156,7 @@ class AddtocartProvider extends ChangeNotifier {
         },
         (response) {
           allitem = response!;
+          _discount = 0.0;
           _totalPrice = double.parse(response.subtotal.toString());
           _grandPrice = double.parse(response.subtotal.toString());
 
@@ -275,14 +276,24 @@ class AddtocartProvider extends ChangeNotifier {
   ) async {
     ispaymentLoader = true;
     notifyListeners();
+    var data;
 
-    var data = {
-      "amount": originalAmount,
-      "addressId": addressId,
-      "cartId": cartId,
-      "couponId": couponId
-    };
+    if (couponId.isEmpty) {
+      data = {
+        "amount": originalAmount,
+        "addressId": addressId,
+        "cartId": cartId,
+      };
+    } else {
+      data = {
+        "amount": originalAmount,
+        "addressId": addressId,
+        "cartId": cartId,
+        "couponId": couponId
+      };
+    }
 
+    print("ksdjfkgjlhdfkg  ${data}");
     try {
       var result = await _homeRepo.paymentOrder(data);
       return result.fold(