PHP - Create Subscriber - How?

Hello Community,

i dont know how i can create with PHP a subscriber in Plesk 12.5.
Important is the informations from customer how:
The general infos (first- and lastname, street ...),
Login datas to plesk (username, password) and
the Subscribe (domainname, username, password, service package).

I hope my english was not to bad .. else excuse me for that.

Sincerly,
Justin