title: Links on web site that can login into app with a token or fall back to web site
body: <p>There is a request to add a link to one of our websites that can open our mobile app on iOS or Android, and login to the app based by passing an authentication token in. If the apps do not exist on either platform I need it to fall back to the associated website. </p>
  
  <p>From what I understand about universal links or deep linking, their intended purpose is to take you to a specific page within an app, not pass along parameters. Custom URL schemes seem to fit better, but also aren't supported the same way and falling back to the web is problematic. </p>
  
  <p>If anyone has ever setup something like this and has resources I can look at it would be appreciated. </p>
  
  <p>Thanks.</p>