Mixed Revenue Generation Based System

Hello group

Has anyone had success at creating a MT OS based system controller utilizing RADIUS to handle AAA in addition to a LINUX based web-server running Apache to inject ads to all browsers of a particular class of clients served by a multi-revenue-source business model?..
If I remember correctly this was achieved VIA HTTP proxy in addition to Apache Handlers in addition to a .cgi script to deliver the Ad content itself to only be viewed by the Advertising Supplemented fixed wireless service???

Client Class example 1
Standard fixed wireless service: 10MB wireless connectivity package serving residential fixed wireless users at $40 monthly.

Client Class example 2
Advertising Supplemented fixed wireless service: 5MB wireless connectivity package which is sold for $15 monthly, the back-end controller of the system and supporting servers would need to inject these ads into predefined location of ALL of these users browsers reliably.

I have attempted searching MT forum (without success) looking for an old article I saw here over a year ago which dealt with this type of configuration, if anyone could point me to an article relating to this would be great!

Thank you for your time
Best Regards