> You’d have these completely over engineered solutions where you’d basically need to call a separate micro services for every “field” of anything. So if you wanted a name, a ssn, and, an address for a citizen you’d need to make several calls.

The official CPR API you can get all of that information with a single call and I think it returns JSON. I'm not sure when that API was released, but I think it was quite a while ago. There is one for companies as well (CVR API, but technically it's just an Elastic Search query iirc).