Tapatalk Conditional Use Based on Usergroup

[MGO_TOM]

It seems that Tapatalk removed the AdminCP function of restricting its use to specific usergroups a few revs ago. My co-admin just did an update, and now anybody is able to login via Tapatalk (which we do NOT want…ONLY our paid members).

How and where can I put an "if" condition that allows logging-in via Tapatalk ONLY if the member is in a specific (42) usergroup?

Ideally, I would like the fault message to say "At this time, Tapatalk use is only available for paid members. Please see our home page for information on how to become a paid member."

vBulletin version 4.2.3
PHP version 5.4.45
MySQL version 5.6.28

Thanks!