Hosting with centos panel

Im just curious if there is any set up information/tutorials available to use centos-panel to sell shared hosting.Im able to set up packages etc but is there some sort of bridge that sets up clients accounts, like billing software.

Idea:

i set up x amount of packages,
the buyer wants to buy x package,
so im thinking of a sign up page or automation for this process that payment received the said package is allocated the user.(similar to whmcs)

If this is available could i get some pointers in the right direction.

at the moment there is no any billing software, but this will probably become available shortly with new versions which will have API

Appreciate you prompt response, long may yours and the teams hardwork continue.