title: Firebase Cloud Messaging (FCM) - Launch Activity when user clicks the notification with extras
body: <p>I'm trying to open a specific activity when the user clicks the notification, when the app is in the background, with some extra parameters. I'm using the <code>click_action</code> and it's working fine, the app opens the desired Activity.</p>
  
  <p>Now I need the server to pass an extra parameter, an <code>id</code>, to this Activity so I can present the desired details associated with the notification. Like an e-mail application, that when we click on the notification opens the details of that specif email.</p>
  
  <p>How can I do this?</p>