title: Using content available push notifications to update iOS app
body: <p>I am building an app that has can be used by the same user across multiple devices. Whenever the user updates a preference on one device, I want the changes to propagate to all the devices with the app whether they are on the foreground or on the background. Can I achieve this using push notifications <code>{aps: {content-available: 1}}</code> payload?
  Is there a restriction on which category of apps can use this?</p>
  
  <p>Thanks</p>