title: Send silent push notification from Firebase console
body: <p>Trying to prove a concept I've been working on for a while, which involves my app recieving a silent notification. I am using Firebase Cloud Messaging as it has less overhead than native APNs for the developer.</p>
  
  <p>I know FCM supports silent notifications when you build the payload yourself on your own backend, which is of course my intention. However, I want to make sure I can do what I want to do with this notification, and therefore want to prove it using the FCM console before I spend time writing my backend.</p>
  
  <p>I have managed to send standard notifications from here, but not silent ones. Even when I include the <code>content-available</code> flag I'm still alerted. I think this is due to FCM always including the <code>alert</code> parameter in the JSON. Is there a way to disable this in the test console?</p>
  
  <p>Many Thanks,</p>