You could, and it wouldn't be used for anything other than what you needed me to know it for - but you also shouldn't, because trusting people on the internet with your credit card number is obviously very risky.
Yes.
Sure, but why?
I won't use it, but there's no point in giving it to me in the first place. Unless you wanted me to use it just a certain amount, I guess. You'd have to give me the expiration date and security code too though. And probably your name, street address, state and ZIP code. And, come to think of it, I can't guarantee I won't use it if I'm absolutely desperate for some reason..
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