As others have already stated, the business practices at Milt Sparks are nothing to worry about. I'm certain they have the ability to safeguard the credit card information, and other personal information, they receive from a customer. If it was not so, they would not be conducting business at the level that they do.
With respect to the CVV code for the credit card being required, it's possible that their credit card company requires that in order to verify the card at the time they process your payment. Each credit card processing company is different in that respect.
U.S. Navy (Retired)
May we always have the freedom to pursue our dreams.