ZOHO PHP SDK: Get User email logged in Zoho

ZOHO PHP SDK: Get User email logged in Zoho

Hello Zoho Team,

I am trying to create a external application linked with Zoho CRM. My purpose is:

1.- Create an application (hyperlink) from Zoho and it redirects to my website. (I dont know if it is possible, it seems easy).
2.- Take the user email which is logged in the Zoho platform, I would like to detect if the user is not logged as well.
** The Zoho platform which I mean will be linked to the server with its Grant_token.

Currently, I have the server working with the grant_token and with the persistent token, but I can not detect if the user is logged or not from my server application.

Best regards,
Andrés