Credit-card numbers

Credit cards, debit cards and the like list their account numbers on the
front with the numbers in groups of 3 or 4, because humans have an
easier time dealing with numbers in small groups than larger. (Compare
phone numbers.)

Why, then, does every online store in the world refuse to let you type
in those spaces when you enter your credit card number? It’s so easy to
verify that you typed the right thing when you compare one grouping at
a time, and incredibly annoying to have to verify the whole thing as one
long number.

I suspect it’s just another case of programmers writing for computers
instead of humans, but the consistency amazes me. Has no-one
looked at a credit card and thought “Hey, there’s a usability feature!
I think they’re on to something here!”.

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