Is there a known way to validate an Estonian business ID? - php

Question

I have to validate an Estonian business ID (not a citizen ID). The ID is 9 numbers, but I think there might be a system of assigning them. For example, here is the Finnish validation with the last number as the checksum
if (preg_match('/^\d{7}-\d{1}$/', $user_input)) {
list($num, $control) = preg_split('[-]', $user_input);
// Add leading zeros if number is < 7
$num = str_pad($num, 7, 0, STR_PAD_LEFT);
$controlSum = 0;
$controlSum += (int)substr($num, 0, 1)*7;
$controlSum += (int)substr($num, 1, 1)*9;
$controlSum += (int)substr($num, 2, 1)*10;
$controlSum += (int)substr($num, 3, 1)*5;
$controlSum += (int)substr($num, 4, 1)*8;
$controlSum += (int)substr($num, 5, 1)*4;
$controlSum += (int)substr($num, 6, 1)*2;
$controlSum = $controlSum%11;
if ($controlSum == 0) {
return ($controlSum == $control) ? true : false;
} elseif ($controlSum >= 2 && $controlSum <= 10 ) {
return ((11 - $controlSum) == $control) ? true : false;
}
}
Usually there is a checksum for all of these types of IDs, so it's not just a matter of running a regex on it, but I can't find anything relating to Estonian businesses.
Any links to known libraries, examples would be appreciated. I'm working in PHP, but these could be in any language.
Thanks.

Answer 1

You can include a SOAP-Call from the European Commission https://ec.europa.eu/taxation_customs/vies/vatRequest.html
It should work like this (not 100% tested):
$vatId = "{{the vat id }}";
$client = new SoapClient("http://ec.europa.eu/taxation_customs/vies/checkVatService.wsdl");
if ($client) {
$cc = substr($vatId, 0, 2);
$vn = substr($vatId, 2);
$params = array('countryCode' => $cc, 'vatNumber' => $vn);
$result = $client->checkVat($params);
if ($result->valid == true) {
echo "VAT-ID ok";
}
} else {
die("connection failed");
}

Answer 2

I found this library, which answers my question
https://github.com/arthurdejong/python-stdnum/blob/master/stdnum/ee/registrikood.py
from stdnum.exceptions import *
from stdnum.util import clean, isdigits
def calc_check_digit(number):
"""Calculate the check digit."""
check = sum(((i % 9) + 1) * int(n)
for i, n in enumerate(number[:-1])) % 11
if check == 10:
check = sum((((i + 2) % 9) + 1) * int(n)
for i, n in enumerate(number[:-1])) % 11
return str(check % 10)
def compact(number):
"""Convert the number to the minimal representation. This strips the
number of any valid separators and removes surrounding whitespace."""
return clean(number, ' ').strip()
def validate(number):
"""Check if the number provided is valid. This checks the length and
check digit."""
number = compact(number)
if not isdigits(number):
raise InvalidFormat()
if len(number) != 8:
raise InvalidLength()
if number[0] not in '1789':
raise InvalidComponent()
if number[-1] != calc_check_digit(number):
raise InvalidChecksum()
return number
def is_valid(number):
"""Check if the number provided is valid. This checks the length and
check digit."""
try:
return bool(validate(number))
except ValidationError:
return False