This modification is currently in beta - do not use it unless you are sure you know what you are doing!
This modification will add the ability to charge users a subscription to join a membergroup for a defined period of time.
Currently this only works with paypal, and maybe worldpay/authorize.net. To install simply run the modification and then enable the mod from the Settings tab in "Paid Subscriptions" from the admin center.
Note for paypal to work you need to setup your account to direct your IPN to this script. To do this login to paypal, click "Profile" and then select the "IPN" link from merchant tools. Enter the URL of your forum, and then the subs/ipn.php. For example: