Credit Cards: We accept Visa, Mastercard, American Express, and Discover credit cards.   CVV2 Numbers: When you choose to pay with a Credit Card, we will also ask for your card's CVV2 number. A CVV2 number (3 or 4 digits) is a security code used to verify you are in possession of the card. See below for examples:     MasterCard/Visa/Discover: The CVV2 number is printed (not embossed) in reverse italics just above the signature panel on the back of your card.   American Express: The CVV2 number is printed (not embossed) just above the Credit Card numbers on the front of your card. Domestic Taxes We are required to collect Sales Tax on orders shipping to California.