What is the best wifi isp software to manage both operability and customer transactions?

Question

I already have a backbone, radio equipment is installed to broadcast

Answer 1

Well if all that is inplace I would get a simple gateway device which would accomplish all of that for you.

One that I found cheap and easy to use was
airepochs (hotspot controller)
You can find it at
http://www.echotechwireless.com/AirEpoch_HGW210_E_Hotspot_Gateway_p/hgw210-e.htm