you cannot go to the following page without putting in credit card number.

Also i dont think you can put in bad cc number as i believe one digit in the number is a check digit ... also some sites now require you to put in the security digits ...

though i found out the expiry date is meaningless, as long as the date is after your transaction - the system will accept it, and charge it ! happened in a real life online purchase - caused me panick and then found out it did not matter.