Shadow Shopper

Shadow Shopper is a resource for mystery shopping. They sent me an email, stating I'd get a week free of the Gold membership. A one year price is $99. You click on the "Free Gold Membership" and they won't allow you to accept it with out documenting your credit card. No where in the posting did it say, IN ADVANCE, that a valid card was mandated. I don't see where it's "Free" except unless you sign up for a higher cost. This is very deceptive.