WebRequest tRequest = WebRequest.Create("https://fcm.googleapis.com/fcm/send");
            tRequest.Method = "post";
            tRequest.ContentType = "application/json";

            var ids = new List<string>();

            if (registrationIds != null && registrationIds.Any())
            {
                ids = registrationIds;
            }
            else
            {
                var receivers = GetPushReceivers();
                if (!receivers.Any())
                {
                    return new Tuple<bool, string>(false, _localizationService.GetResource("PushNotifications.Error.NoReceivers"));
                }

                foreach (var receiver in receivers)
                {
                    if (!ids.Contains(receiver.Token))
                        ids.Add(receiver.Token);
                }
            }

            var data = new
            {
                registration_ids = ids,
                notification = new
                {
                    body = text,
                    title = title,
                    icon = pictureUrl,
                    click_action = clickUrl
                }
            };

            var data = new
            {
                registration_ids = ids,
                notification = new
                {
                    body = text,
                    title = title,
                    icon = pictureUrl,
                    click_action = clickUrl,
                    sound: "default" // Enable Sound
                }
            };