public function validate($vatNumber)
{
if (strlen($vatNumber) == 9) {
$vatNumber = "0" . $vatNumber;
}
if (strlen($vatNumber) != 10) {
return false;
}
$checkvals = (int) substr($vatNumber, 0, -2);
$checksum = (int) substr($vatNumber, -2);
if (97 - $checkvals % 97 != $checksum) {
return false;
}
return true;
}