26. I registered with my credit card and saw on my statement that I was charged $1. What was this for?

During the registration process for Credit Card users, the bank is sent a request to verify that the Credit Card being registered is in good standing with the bank; i.e. not stolen, is within limit etc. The $1 is not charged to the account but is held for a maximum of 10 days as banking policy until the card is proven valid.