Thank you for the plugin name. We'll check it and let you know. As far as i noticed our team has received request from you. They'll contact you seen.

That depends on the membership plugin you use. So let me know how are you handling your memberships. 

Thanks for that. In my use case, forum access is not for them to choose or not. Rather, it's a privilege based on their membership (or course purchase, etc.)

Based on your advice, I contacted gVectors for the possibility of a paid solution. But I'm also interested in suggesting opening up any sort of API access, which can solve so many problems without being strictly limited to available integrations. What do you think?

Thanks

I think the only way is using User Custom Fields addon and put the Secondary Usergroup field in the Registration for letting users to select the group they want to attend. So, once they registered they'll get their selected secondary usergroup.

As a paid solution you can request for creating an addon for your membership plugin integration. Please let me know what membership solution you use we may already have a custom code for that plugin? 

Ok, I understand what you said. So let me ask you the bottom line question: Is there ANY way to automate assigning secondary usergroups to users, thus grant them access to restricted forums automatically? That's my ultimate purpose: To automate adding and removing users to/from the forums. Whichever's the possible way to do it, I'm ok with

Thanks

It's really hard to understand what's going on in your WordPress. Again, if users have more than one user role then we cannot support such synchronisation. 

I think it's not a good idea to try synchronize usergroups with roles using secondary user groups. It'll work fine if you only use primary usergroups and don't use secondary usergroups. We cannot do a deep debugging of multiple roles with usergroups, it's a time consuming and hard taks.

Ok, thank you for all your great support. Now I think that I understand how it works, and my confusion is clarified. But I still couldn't figure out how to automate my setup.

Here's an example use case:

User johndoe buys the two memberships: Marketing bundle, Sales Bundle

Each automatically assigns WordPress roles (as bellow), which synch with each's usergroups; aiming at automatically giving access to the designated forum like this

marketing-user (role) -> MarketingUserGroup (secondary usergroup) -> Marketing Forum

sales-user (role) -> SalesUserGroup (secondary usergroup) -> Sales Forum

By assigning the second role (sales-user here), it gets synched correctly with its usergroup, but it cancels the member from all other usergroups (MarketingUserGroup). Is this how it should work? And what's my solution here?