When putting in the itunes card number must it be upper case?

ThanksWhen putting in the itunes card number must it be upper case?
no, it should be upper case even if you do not put it in upper case.When putting in the itunes card number must it be upper case?
No. It does not have to be uppercase. The computer/account will notice what it is. For example. SweetGuy@whatever.com can also be typed in as sweetguy@whatever.com. The computer will reconize this. So the answer is No.