title: Integrate iframed form into wordpress site with identity server
body: <p>We currently have an Angular booking app that lets a customer login. When they click a login, they are redirected to a page on our identity server where the login. They are then redirected back to our app. 
  What we would like to do is to iframe our app into a wordpress site and move the login functionality from the angular app to the wordpress site. 
  Has anyone done anything like this? What do I need to do, as I'm not sure where to start. Looking for an example.</p>