Im working on a subscription feature to let you charge for access to your game server. Basically you set up a joomla web server to manage the subscriptions and there is a plugin that talks to your lugdunon server to process new subscriptions/cancels every 5 or 10 minutes. You can also do things like restrict posting to a forum on your server to people with active subscriptions.
The joomla part is mainly done, what i am working on is the glue code between the web server and the lugdunon server. That depends on mods to the lugdunon server to support it.
Any questions?