Quote from 203bravo
OP never said that they put in the incorrect credit card number but rather the incorrect exp date and security code.
OP - the reason that you seem to be getting the "good pop up" at this time is because you were charged and a new test registration was created in your name and since you can only have one open registration of course the system is now going to tell you that you have currently have an open registration and a new one cannot be created at this time.
I took my exam a few weeks ago and did just that (put the wrong security code) and my card was declined, I then put the correct one in and it charged me. It doesn't matter if you put the wrong card #, security code, or exp. date...
If you passed, it will tell you that you currently have an exam scheduled and another cannot be made at this time. If you didn't pass, it will charge you given the correct numbers or decline and ask for new payment if you entered any incorrect information.
The reason you got a good pop up after payment is because technically you have already registered (paid) for a new exam.
But it's ok.... you will pass this time =)