I don't know what PSB is, sorry. But I did book the Princess Tea Party today and while I don't know for certain, I expected that they were going to charge my credit card now. - I can tell you for certain tomorrow LOL
I had to give my credit card as a guarantee for the Brown Derby Fantasmic Package (I think it was the package that did it, not the Brown Derby per se), and also Akershus.
Oh, wait, just figured out what PSB is. Yes, credit card guarantee - but not charged. They will charge your card $10/person if you don't show up.