C validating a credit card number
Swift port can be found at https://github.com/Max Kramer/Swift Luhn.
It's as simple as calling one single method; no special formatting is required.
A check digit is a digit added to a number (either at the end or the beginning) that validates the authenticity of the number.
In algorithm form: This makes the full account number read 79927398713.
First is the Luhn Algorithm that gets the proper checksum for the card, the second method is the Bin Number Checker.
The first six digit number on a bank card is know as the Bank Identification Number (BIN) which identifies the location of the bank that issued the card, while the latter portion identifies the specific name of the bank.
Check Digit Scheme can be used when an end-user has entered in a credit card number and you want to validate it before sending it an authorization.
This self-checking scheme (referred to as the Luhn Mod-10 Method) is an international standard for validating card account numbers (ISO 2894/ANSI 4.13).