call method
Implementation
@override
Future<BalanceModel?> call() async {
var response =
await Future.wait([_findEstablishmentById.currentId(), _userToken()]);
for (var element in response) {
if (element == null) return null;
}
var result = await _repository.getBalance(
appId: response.first.toString(),
tokenClient: response.last.toString());
return result;
}