We have Boscovs near here and my SIL used to work for them. They piece together their own charter packages (flight room tickets) using group space. In order to do it this way, they have to charge the card themselves and pay the companies that supply the pieces. She also said they reserve through group at NET cost then add their commission on to the package.
Since the charge is not directly from WDW Travel as a package of theirs, you do not qualify for the 0%