# 1 Not limiting the number of characters in this field
Not everybody understands what all these stupid abbreviations mean. In your case it's the request for...what is it?...CVC code? The 3 digit security code on the back of the credit card. Do not assume everyone knows what that means. I didn't at first and there were no explanations and old people get pissy when the IT morons start assuming everybody is up to speed.
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