title: Can apple push notifications send more parameters than alert and sound?
body: <p>I have several pieces of metadata that I need to associate with a push notification.</p>
  
  <p>For example user no, message id.</p>
  
  <p>Can I send more parameters than what apple supports:</p>
  
  <pre><code> {aps =     {
      alert = joetheman;
      sound = default;
  };}
  </code></pre>
  
  <p>Is this possible?</p>