Billing is one of the many challenges that confront
web hosting providers. There are just so many things
to keep track of customer profiles, invoices, credit
card charging, etc.
But unlike businesses of old
when everything was done on paper, you now have the
added option of automating the billing process using
a variety of software applications in the market
that are designed specifically for this function.
One such automated billing software, designed for
web hosting operations, that you might want to
consider is ModernBill by ModernGigabyte LLC(Version
4.2.1 Build 9 is it's latest stable release).