From: "My List Mail" <mylistmail at gmail dot com>

> what i want is to run m0n0wall
> under it is a hotspot server where it can create
> a prepaid accounts which can be billed/sell by time usage.

> in short, its a billing system and account generation system
> in one central server.

OK, lets narrow this down to the things you need.  You need a transport 
medium, like an AP.  You need some captive portal, like m0n0wall, at each 
location.  You can put a wireless card in m0n0wall, but host AP is less than 
fantastic.  You need an authentication system, most likely a RADIUS server. 
You need an account generation system.  And you need some way to take 
payment.

An AP and a m0n0wall box at each location would work to capture traffic.  A 
central RADIUS (like free RADIUS) would work for authentication.  The rest 
is beyond me.  I would suggest looking in groups for RADIUS, and online 
billing, as that is where the gap lies for you.

                        Lee