How to make a auto donation panel!

So I was wondering how I could make a automatic donation Panel like http://unleashedservers.com/riotbilling/cart.php. If some one could point me to a video tutorial or tell me how to do this that would be great. Thanks.

Yeah that’d be cool, I heard it’s pretty difficult though.
Basically as far as I know you have to make some sort of script to run a rcon command once they donate.