You just have to have it tied to your WestJet ID and have that added to your booking. The only catch is that the 8 people MUST be on the same booking ID otherwise they won't get it. Also the primary card holder MUST be traveling also, if not you don't get it. Even though my wife and I have a joint card I am considered the primary card, so if she books a flight without me she has to pay for her bags if they aren't included in the fare.