[superpokermon]

They may shut off your card if you don't call them back. There's a good chance they won't ask what the transaction is for, they just want to know that you authorized it and your card wasn't stolen and used without your permission. If they do ask, I would assume they don't know, so I would make up something. Definitely don't use the word sportsbook during the call! Hopefully it will just be a matter of saying you approve, and have a nice day. That has been the case with other posters on this forum.