Post-pay almost always has some sort of credit limit -- if only for fraud prevention.
I have a user variable called cutoff. For prepaid, it's set to 0. For those I trust, I set it to a negative number.
That's the number I use to calculate how much credit is left on their account.

That way the same mechanism works for both prepaid and post-paid.

-Avi



On Thu, Jan 30, 2014 at 3:29 PM, Callum Guy <callum.guy@x-on.co.uk> wrote:
Thanks Avi, that looks like a neat little solution for billing. Unfortunately my requirements are for pre and post-pay billing and rating so i'm looking for options for a comprehensive package.