hello all

I'm about to purchase a dedicated server with Plesk 7 pre-installed but before I do I'm wanting to change my previous ordering script so it will automatically set everything up in plesk. My question is:
Is there any (proper) documentation that would advise you on how you would go about this in PHP? There are a lot of billing sites that intregrate with plesk but I'm not going to spend $$$ on software just to rip a few lines of code out!

Any help/pointers would be much appreciated!