ISPCP billing?

[borzu]

Hi,

I am going to use ispCP in a real shared hosting environment. I installed it on my sandbox vps and quite like the sophisticated features. One can manage every essential thing with ispCP apart from (I think) billing.

So I'm wondering what is the best way to implement billing to the scheme? I use Drupal as my shared shopping window, so I guess I can use Ubercart module to set up a billing scheme, but I am not sure this would be a practical (or best) solution.
So I appreciate any suggestion of your fantastic guys out there.