CypherJF 14:03, Sep 28, 2006 (PDT): it's because no one has documented it. I've asked Lord Maucaub some time ago to provide me with the documentation he created for it but he has since long disappeared. I think I also asked 2dragons for it but that was a no go either.
Mine GO BOOM 14:34, Sep 28, 2006 (PDT): Sounds like a good project. ASSS has source code for it, Catid made his own replacement billing server. Both ends have full open source for it, shouldn't be hard to throw up a quick layout and let people add in the details.