Auto Login from WHMCS (no replies)

Hi,

I'm using WHMCS (for my hosting client portal). I want my clients to be able to click on a button and be automatically logged into piwik on a new page. My main issue is I don't know how to get their password into the URL string as described here:
[piwik.org]

If anyone is familiar with WHMCS I was wondering if you could help me with modifying this link so that it looks right:
/https://www.mypiwiklocation.com/index.php?module=Login&action=logme&login=LOGINGOE SHERE&password=MD5PASSWORDGOESHERE

Or if anyone can offer an alternative way to automatically log my clients into their piwik account that would be great.

Thanks in advance.