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probably the most straightforward way would be to create members.yourblog.com, password protect that using standard .htaccess/.htpasswd setup... then use normal biller script to add remove users from .htpasswd file... then hire someone to write a quick wp plugin to redirect certain category to members.yourblog.com
something along the lines of ->
if(category_id=xxxx and host!='members.yourblog.com')
redirect to 'members.yourblog.com'
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