title: Get auth from topdesk site being opened within iframe
body: <p>I have a topdesk board, and connected external site via url, so my site is opened within iframe from topdesk.</p>
  
  <p>My task is to get logged in user (at least its email) from topdesk.
  I have found so far this api: <a href="https://developers.topdesk.com/explorer/?page=supporting-files#/Persons/getLoggedInPerson" rel="nofollow noreferrer">https://developers.topdesk.com/explorer/?page=supporting-files#/Persons/getLoggedInPerson</a></p>
  
  <p>But it requires to get auth key from login/password, but I do not user login/password from UI side.</p>
  
  <p>So I do not see any straightforward solution, but maybe I could somehow to get cookie from parent topdesk view or something like that.</p>