Depends on the book. I have used my CC at WWTS. They use a credit card processor in Sweden. It was processed as a purchase instead of a cash advance which was huge. Since it is a "purchase", I am pretty sure any card can be used.
Your credit card company will probably contact you about the charge since it is oversees and they check on unusual card activity. My CC company called and the lady even asked me if it was for gambling. Of course I said "No" and made something up. I forgot what is was. I think I said I bought something for my girlfriend from a Swedish company.
LOL
IS