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The method checks the credit card number according to the Luhn algorithm. The transmission of credit card data is not supported for gladCONTRACT. The real meaning of the numbers on your credit cards

A series of numbers on the front of a credit or debit key is enough to bewilder even the most intelligent buyer. However, each number still has a critical part to play in the identification of cardholder, banking and banking information and in securities control. As the Pittsburgh Post-Gazette reported, the only organisation that can allocate numbers to certain network such as Visa or MasterCard and finance institutes such as the Bill of America or JP Morgan Chase is the non-profit American National Standards Institute.

The Post-Gazette declares that a computer uses the card's magstripe to guide the transactions through the correct networks of cards and then to the banks indicated on the cards to authorise the transactions. All cards, whether networks or banks, must match the "Luhn system" that defines the credit limit of a credit or debit cards.

It is a numerical algorithms in which different numerical permutations must be added to a number with a final value of 0, and if the sum of the permutations results in anything other than a multiples of 10, the map is void. In general, the first or second number of a credit or charge is for the cardholder, followed by numbers that define everything from the denomination used to the banking institution handling the transactions to the person's number.

The American Express uses the first two numbers of the map to help identification. Either 34 or 37 is this two-digit number. Three and four numbers indicate the cardholder model and the Clearpoint Credit Counseling use. Next six numbers, five to 11, are the number of the bankroll, while numbers 12 to 14 are the number of the cards within the bankroll.

Its last number is a verification number, which is a chance number used to guard against mistakes and cheating, said Jason Oxman, CEO of the Electronic Transactions Association, the post-gazette. All Visa card numbers have four first digits, and the second to six digits are associated with the bank.

Then either the 7th to twelfth number or the 7th to fifteenth number is the number of the checking account, while the last number is the cheque number. The MasterCards use the number five first in their 16-digit order. Second and third, second and forth, second and fourth or second and fifth then constitute the banking relationship, Clearpoint Credit Solutions states.

After the third, fourth or fifth number, any number up to 15 is the bank number, while this last number, 16, is the verification number. Each Discover card begins with number six and has 16 characters, while Mineral Oil begins with number seven and Flight Tickets begin with number one.

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