![]() If it is not divisible by 10, the number is invalid. If the final sum is divisible by 10, then the credit card number is valid. Step 4 - Add up all the digits in this number Step 3 - Now add the un-doubled digits to the odd places This will results in eight single digit numbers. Step 2 - If doubling of a number results in a two digits number, add up the digits to get a single digit number. Step 1 - Starting with the check digit double the value of every other digit (right to left every 2nd digit) Here are the Luhn steps which can used to validate the credit card number. When you implementing eCommerce application, It is a best practice validating credit card number before send it to the bank validation. It was created by IBM scientist Hans Peter Such as credit card numbers, IMEI numbers, National Provider Identifier numbers in US and Canadian Social Insurance Numbers. The Luhn algorithm or Luhn formula, also known as the “modulus 10″ or “mod 10″ algorithm, is a simple checksum formula used to validate a variety of identification numbers, It is used to validate the credit card number using Luhn algorithm (Mod 10 algorithm). Last digit is known as check digits or checksum. ![]() Taking away the 6 identifier digits and the last digits, remaining digitsĪre the person’s account number (7th and following excluding last digits) It will identify the institution that issued the card. The first 6 digits are the Issuer Identification Number.
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