title: How to send some additional data while sending push notifications using OneSignal?
body: <p>I am developing an Android application as well as writing writing a C# Web Api for it. Now i can send push notifications using the code below. But i have to send a json object which will contain a url for an image so that when user clicks the notification , an activity in the app opens and using that url loads the image using Picasso. How should i do it?</p>
  
  <pre><code>private void SendPushNotifications(int userId)
      {
          string appId = "myAppId";
          var request = WebRequest.Create("https://onesignal.com/api/v1/notifications") as HttpWebRequest;
          var user = db.Users.FirstOrDefault(x =&gt; x.Id == userId);
          if (user != null)
          {
              string message = "This job is posted by: \n" + user.Name + "\n" + user.Contact + "\n" +user.City;
              if (request != null)
              {
                  request.KeepAlive = true;
                  request.Method = "POST";
                  request.ContentType = "application/json";
  
                  request.Headers.Add("authorization", "Basic "+appId);
  
                  byte[] byteArray = Encoding.UTF8.GetBytes("{"
                                                            + "\"app_id\": \"app_id\","
                                                            + "\"contents\": {\"en\": \""+ message +"\"},"
                                                            + "\"included_segments\": [\"All\"]}");
  
                  string responseContent = null;
  
                  try
                  {
                      using (var writer = request.GetRequestStream())
                      {
                          writer.Write(byteArray, 0, byteArray.Length);
                      }
  
                      using (var response = request.GetResponse() as HttpWebResponse)
                      {
                          using (var reader = new StreamReader(response.GetResponseStream()))
                          {
                              responseContent = reader.ReadToEnd();
                          }
                      }
                  }
                  catch (WebException ex)
                  {
                      System.Diagnostics.Debug.WriteLine(ex.Message);
                      System.Diagnostics.Debug.WriteLine(new StreamReader(ex.Response.GetResponseStream()).ReadToEnd());
                  }
  
                  if (responseContent != null) System.Diagnostics.Debug.WriteLine(responseContent);
              }
          }
      }
  </code></pre>
  
  <p>with this "message" string i also want to send a json object.</p>