https://forums.modx.com/thread/?thread=16895 https://forums.modx.com/thread/16895/how-do-i-registration-for-users-to-join-a-group#dis-post-91677
http://wiki.foxycart.com/integration:modx:usersubscriptions
http://modxcms.com/FoxyCart-Webuser-Paid-Subsciptions-1682.html

Also, it’s set up to work with subscriptions (where access would be revoked if their subscription expires), but could really easily be set to just add access and ignore any sort of expiration. If you need help with it post on the support thread for it:
http://www.modxcms.com/forums/index.php?topic=19129]]> The Man Can! Jan 20, 2008, 03:43 AM https://forums.modx.com/thread/16895/how-do-i-registration-for-users-to-join-a-group#dis-post-91677 https://forums.modx.com/thread/16895/how-do-i-registration-for-users-to-join-a-group#dis-post-91676 trevor737 Jan 13, 2008, 12:18 PM https://forums.modx.com/thread/16895/how-do-i-registration-for-users-to-join-a-group#dis-post-91676