paystack_ui.dart

 Theme(
                      // use themedata to alter the styling of the child widgets
                      data: ThemeData(primarySwatch: Colors.purple),
                      child: Builder(builder: (c) {
                        return FlatProgressButton(
                          onPressed: () async {
               
                                _paystackDialog(c);
                           
                          },
                          label: "Pay with Card",
                          isBusy: false,
                          color: Colors.transparent,
                          textColor: DirechargeColor.primaryColor,
                          border: BorderSide(
                              color: DirechargeColor.primaryColor, width: 2.0),
                        );
                      }),
                    )