title: Is it possible to set up a REST data source on apex.oracle.com with OAuth2?
body: <p>I'm attempting to add a REST data source from Xero.com to my app on apex.oracle.com. I've confirmed my credentials work properly when connecting to Xero's Oauth2 api from elsewhere, but I can't connect from the REST data source wizard. I suspect this is because the authorized redirect URI I am providing to Xero is incorrect. I have been providing the URL &quot;https://apexea.oracle.com/pls/apex/apex_authentication.callback&quot; as recommended by <a href="https://fuzziebrain.com/content/id/1709/" rel="nofollow noreferrer">this guide</a>.</p>
  <p>Is there another callback URL I should be using, or, if not, another method then the REST data source wizard by which to connect?</p>