[UK Jimbo]

Untested...

You should be able to add the following conditional statement around the payment link in templates to prevent it appearing to users who aren't in group 10. Any code inbetween these two tags will only appear to member of group 10.

<if condition="is_member_of($bbuserinfo, 10)">

</if>

You can also prevent users who aren't in that group from accessing the page itself by adding a new plugin with the hook location paidsub_start

PHP Code:

if(! is_member_of($vbulletin->userinfo,10) ) {
    print_no_permission();
} 


This should show an error message for users that aren't in group 10 preventing them from seeing the page.