Preventing a users from inviting another user to an invite Group!

Hello Stack Ideas

I am using Groups to display videos and let people answer questions.
I had a developer write a plugin so that when a users buys a product he gets invited into an ES Group.

The heart of this plugin was some code that Mark kindly posted:

$group = ES::group($groupId);



$group->createMember($user->id, true);

After development and testing of said Plugin this works perfectly.

The thing is that having purchased access to the group (essentially purchasing an invite) a user can then go and invite another user.

I know that this is a Private invite Group and that is a good thing.
It is just that I want to be able to control the invites via Hika Shop.
And not have users inviting other user to join.

Is there a way to prevent/block users from inviting other user to join a group.

Whilst NOT* breaking my plugin that essentially lets Hika Shop invite people to join a group after purchase.

If possible only for Groups in the Category "Study Groups"

https://finalbug.net/groups-learn-post-production-socially-fcpx-and-more/categories/11-studygroups/latest

thanks

Paul

*Apologies about the capitals but this is the mission critical part