Viator is a complete online travel company and uses a completely secure and automated booking system, therefore we can only accept bookings made online, using an authorized and valid credit card. Fax, telephone or other booking methods are not accepted. Viator uses the Secure Sockets Layer ("SSL") supported by Microsoft Internet Explorer and all other popular browsers. SSL encrypts your personal information such as your password, address and telephone number, and your credit card is available only to you and the credit card companies. This encryption makes doing business on the Internet as secure as making purchases by telephone.