title: Firebase, Swift: Send a push notification to specific user given device token
body: <p>I have a Firebase Swift chat app where I'd like to send a push notification to a specific user. I have already captured and have access to the user's device token. </p>
  
  <p>All the references mention having to have a 'web app' to manage this, but I haven't managed to find any specific examples of this.</p>
  
  <ol>
  <li><p>Is it necessary to have a web app to manage push notifications for Firebase? </p></li>
  <li><p>If so, are there any examples of how this can work?</p></li>
  </ol>
  
  <p>Thank you.</p>