"CCID" is a Credit Card I.D. (identification) number. It's on
the back of your Visa or MasterCard, above your signature.
It's an "extra" 3-digit number that is shown after the last
four digits of your card/account number. (Not after the
*entire* card number- the card shows the last 4, then
the I.D.)
Discover cards don't show them.
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