I trying your plugin to work in my test Wordpress environment but so far it failed. I have setup a test site at mytest.sbedigital.com, the problem is when the links are clicked they just return back to the same page and even login page don't work.
For your information I am running on:
Wordpress 3.9 with latest update.
Wordpress default 2013 theme.
No plugin other plugin activated except your WHMCS Integration.
Just visit mytest.sbedigital.com see for your self.
Your urgent response is really appreciated.