Algorithm::CheckDigits::M97_001(3)

NAME
CheckDigits::M97_001 - compute check digits for VAT Registration Number (BE)

SYNOPSIS
  use Algorithm::CheckDigits;

  $ustid = CheckDigits('ustid_be');

  if ($ustid->is_valid('136695962')) {
        # do something
  }

  $cn = $ustid->complete('1366959');
  # $cn = '136695962'

  $cd = $ustid->checkdigit('136695962');
  # $cd = '62'

  $bn = $ustid->basenumber('136695962');
  # $bn = '1366959'

DESCRIPTION

  ALGORITHM

1.  The whole number (without checksum) is taken modulo 97.

2.  The checksum is difference of the remainder from step 1 to 97.

  METHODS

is_valid($number)
    Returns true if $number consists solely of numbers and the last digit is a valid check digit according to the algorithm given above.

    A leading 'BE' before the numbers will be ignored.

    Returns false otherwise,

complete($number)
    The check digit for $number is computed and concatenated to the end of $number.

    Returns the complete number with check digit or '' if $number does not consist solely of digits and spaces.

    A leading 'BE' before the digits is ignored for the computation and retained for the result.

basenumber($number)
    Returns the basenumber of $number if $number has a valid check digit.

    A leading 'BE' before the digits will be ignored and not returned with the result.

    Return '' otherwise.

checkdigit($number)
    Returns the checkdigits of $number if $number has a valid check digit.

    Return '' otherwise.

  EXPORT
None by default.

AUTHOR
Mathias Weidner, "<mamawe@cpan.org>"

SEE ALSO
perl, CheckDigits, <http://www.pruefziffernberechnung.de>. <https://en.wikipedia.org/wiki/VAT_identification_number>