Guide to extending Cpanel functionality?

Is there information on extending Cpanel to call outside scripts?

For example, we already have a PHP script that automatically creates a SuperUpdate (http://www.superupdate.com) account based on site url, username, password, and root directory. We would like to have a check box in Cpanel for the hosting company to automatically enable or disable the SuperUpdate account for that particular client. Any help or pointers would be appreciated.

TIA,
David