.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,                     notification = new                     {                         body = message,                         title = "SpAlert",                         sound = "Enabled"                     }                 };                 var serializer = new JavaScriptSerializer();                 var json = serializer.Serialize(data);            

Step by step guide: 1) In your shared project, create an Interface called IPushNotificationRegister public interface IPushNotificationRegister {     void ExtractTokenAndRegister(); } This interface is used for fetching the push token and then send it to the server. this Token is unique per device. 2) In Your shared proejct, you should invoke ExtractTokenAndRegister (using your favourite IOC, I called it right after login). Android Implementation: 3) Add Receivers for listening to events received by Google GCM service: a) [BroadcastReceiver] [IntentFilter(new[] { Intent.ActionBootCompleted })] public class GCMBootReceiver : BroadcastReceiver {     public override void OnReceive(Context context, Intent intent)     {         MyIntentService.RunIntentInService(context, intent);         SetResult(Result.Ok, null, null);     } } b) [assembly: Permission(Name = "@PACKAGE_NAME@.permission.C2D_MESSAGE")] [assembly: UsesPermission(Name = "android.permission.WAKE_LOCK")] [ass