void Start()
{
Debug.Log("InitOneSignal mono behaviour Start() -->");
OneSignal.SetLogLevel(OneSignal.LOG_LEVEL.VERBOSE, OneSignal.LOG_LEVEL.NONE);
OneSignal.StartInit(OS_APP_ID)
.HandleNotificationOpened(HandleNotificationOpened)
.EndInit();
OneSignal.SetLocationShared(false);
OneSignal.inFocusDisplayType = OneSignal.OSInFocusDisplayOption.Notification;
Debug.Log("<-- InitOneSignal mono behaviour Start() done.");
}