If you have ever rented anything and had to leave a Credit Card imprint, what else did you need to do with that imprint? I'm not talking about a deposit, I'm talking about "That'll be $60 for the equipment, and, additionally, I'll need a CC imprint. We'll tear that up when you return the equipment" Have you ever been asked to sing that imprint? i.e. the sotre now has an imprint of your Credit Card - on a Credit Card slip with the number value blank, and your signautre at the bottom.