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The first digit is a three.
The security code on any credit card would be the last set of digits on back of the card with is the three digit number
This is the three numbers located on the back of the card by your signature.
Most cases it is three, and they are the last numbers on the back of your card.
the first for numbers of a credit card is well... the first 4 numbers for ex. 0000 0000 0000 0000 the first 4 ... its simple