KID number (actually KID, customer identification) is a number used in bill payment in Norway to identify the payment (regardless of who pays the bill). It can be from 2 and up to 25 digits long. The last digit of the KID number is a check digit. This check digit is calculated from the MOD10 or MOD11 algorithm.

• Luhn MOD10 and MOD11

    kid.Verify(code, new(Luhn10))

    kid.Verify(code, new(Luhn11))

    luhn10 := kid.Luhn10{}
    checkDigit, err := luhn10.Generate(code)
    // e.g. 7, nil

    luhn11 := kid.Luhn11{}
    checkDigit, err := luhn11.Generate(code)
    // e.g. '-', nil

• ErrorInvalidCodeLength: KID has an invalid length
• ErrorInvalidNumber: KID has an invalid character (not a digit)

Released under the MIT License.