Login from remote site via link with hash

Hi
Is it possible to log in to s2member from a remote site using a link with a hash (md5)?

Example
My customer click a link on their intranet:
https://mysite.com/s2member/s2member.php?hash=nnn&date=today
– And they get logged in to mysite.

I realize this may require some customization?
In that case – can anyone give me a hint how to do it?
Thanks

https://www.ads-software.com/plugins/s2member/