[Typo3] paypal & usergroup subscription

[Joe Frontman]

hello,
is there a paypal extension which you could hook to certain usergroups?
so when users sign up to a usergroup (e.g. property reviews), they would 
have access to that usergroup for a period of time.

I think that this would be a very useful extension for a lot of 
webdevelopers... how about you?

I heard that drupal is capable of such a feature... it would be a pitty 
if typo3 couldn't do that.

thanks

joe