CVR (Momsregistreringsnummer, Danish VAT number).
The CVR (Momsregistreringsnummer, VAT) is an 8 digit number with a straightforward check mechanism.
>>> validate('DK 13585628')
'13585628'
>>> validate('DK 13585627')
Traceback (most recent call last):
...
InvalidChecksum: ...
Calculate the checksum.
Convert the number to the minimal representation. This strips the number of any valid separators and removes surrounding whitespace.
Checks to see if the number provided is a valid VAT number. This checks the length, formatting and check digit.
Checks to see if the number provided is a valid VAT number. This checks the length, formatting and check digit.