You will not be asked for money when you make your booking: in fact your credit card will only be used to guarantee the booking you have made. The only exception are for special rates with special conditions like Internet rates.
Your credit card booking is certified by Verisign.
The Grand Hotel Capo Testa booking service has a secure server: when you book on-line your personal details and your credit card details are encrypted and protected. The coded data can not be read during the transfer and once they reach our server they are decoded and saved in secure data bases.