.Net and Xamarin Developer

        public bool SendPushNotification(string deviceId, string message)         {      //applicationID = "AIzaSyxxxxxxxxxxxxxxxxxxx"     // senderId = "98xxxxxxxxx"             bool isSent = false;             string str = "";             try             {                 WebRequest tRequest = WebRequest.Create("https://fcm.googleapis.com/fcm/send");                 tRequest.Method = "post";                 tRequest.ContentType = "application/json";                 var data = new                 {                     to = deviceId,   ...