In addition, the luhn algorithm is used to verify all data. In fact, the luhn algorithm is very simple, that is Starting from a single digit (first digit), the number of the second digit (next digit is a hundred digits) is added, starting from the tenth digit (second digit), and the number of the second digit (next digit is a thousand digits) the number multiplied by 2. If the number is greater than 9, then the number 9 is subtracted and the two and the result are added. If it is a multiple of 10, the card number is correct. .
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