credit card usage

[alcan33]

Is it not true that if you give a merchant your credit card number, they must tell you the amount of the charges before it is considered authorized??
Or is it considered authorized just by giving them the number?
I don't see how it can be considered authorized if the cardholder is not informed of the amount being charged.
Anybody have some knowledge on this?

 

[JETX]

Once you give someone your credit card number and expiration, that is authorization to charge to that card.

I can't imagine anyone giving a merchant their card (or numbers) without knowing what the final cost is.