Multi Site, Buddy Press, and Directory Plugin Configuration

It would be helpful if WPMU could have step by step instructions on how to install the Directory plugin with the Multi Site / Buddypress install. Is there someplace that has this info? If not, can WPMU provide it?

To clarify:

WP multi site install
Sub domains with domain mapping
BP network activated

WIth this configuration, how should the directory plugin be used if you want to have paid listings on each subdomain?