This is from the same government that requires companies submit tax information via a special spreadsheet which has 7 boxes for the 7 numbers they need... But rather than make a webform with 7 textboxes, they make a private JSON API which only approved software vendors have access to, and you then need to use a third party to send your spreadsheet via the private API that only the third party is approved to access...…
I've seen some tools bypass this and still allow you to input numbers manually but just via the vendor API.