You have to put following snippet when your app gets opened after clicking on Push Notification.
	 
	ServiceAPI serviceAPI = new ServiceAPI(“YOUR API KEY”,”Your SECRET Key”);
	serviceAPI.BuildLogService().SetEvent("Message", "Opened", new UnityCallbackClass()); // Unitycallback class is your callback class for App42
	This will track the message and should be able to see it in dashboard under push notification graph.