async void SendNotification()
        {
            try
            {
                HttpResponseMessage response = await NotificationRequest.GetNotPulledNotifications();

                if (response.IsSuccessStatusCode)
                {
                    string response_content = await response.Content.ReadAsStringAsync();

                    List <AppUserNotification> user_notifications = JsonConvert.DeserializeObject <List <AppUserNotification> >(response_content);

                    if (user_notifications.Any())
                    {
                        foreach (AppUserNotification user_notification in user_notifications)
                        {
                            HttpResponseMessage responseOb = await ObservationRequest.GetObservationById(user_notification.Observation);

                            if (responseOb.IsSuccessStatusCode)
                            {
                                string response_contentOb = await responseOb.Content.ReadAsStringAsync();

                                RequestObservation observation = JsonConvert.DeserializeObject <RequestObservation>(response_contentOb);
                                string             title       = "🚨 Good news! 🚨";
                                string             message     = "💰 Your observed product: " + observation.Product.Title + " is now available for: €" + user_notification.Notified_price + " 💰";
                                notificationManager.SendNotification(title, message);
                            }
                            else
                            {
                                if (responseOb.StatusCode == System.Net.HttpStatusCode.BadGateway)
                                {
                                    await DisplayAlert("Try Again!", "No connection with the server", "OK");
                                }
                                if (responseOb.StatusCode == System.Net.HttpStatusCode.BadRequest)
                                {
                                    await DisplayAlert("Try Again!", "Invalid request", "OK");
                                }
                            }
                        }
                    }
                }
                else
                {
                    if (response.StatusCode == System.Net.HttpStatusCode.BadGateway)
                    {
                        await DisplayAlert("Try Again!", "No connection with the server", "OK");
                    }
                    if (response.StatusCode == System.Net.HttpStatusCode.BadRequest)
                    {
                        await DisplayAlert("Try Again!", "Invalid request", "OK");
                    }
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("No notification");
            }
        }