checkout method
Implementation
@override
Future<CheckoutResponse> checkout(
BuildContext context,
CheckoutMethod checkoutmethod,
) async {
// assert(() {
// _validateChargeAndKey(charge);
// return true;
// }());
_performChecks();
controller.checkoutmethod = checkoutmethod;
CheckoutResponse? response = await showDialog(
barrierDismissible: false,
context: context,
builder: (BuildContext context) => CheckoutWidget(),
);
return response!;
}