Paid Subscription Question

[punk23]

Hi all,

I am thinking of using the paid subscription option on one of my forums. I currently use GAB (banner system) successfully on that site and it has an option to choose which usergroups to display ads to.

I have created a new usergroup for the paid subscriptions and tested that all works ok.

MY QUESTION

As many of my users have secondary usergroup membership that can see the ads...how do I set up the paid subscriptions so that these groups are removed automatically once the user pays for a subscription and is promoted to the non-ad usergroup?

Thanks for your time.