It seems MitID isn't mentioned in The Copenhagen Book: https://www.google.com/search?q=site%3Athecopenhagenbook.com...
Iceland and the Faroes follow the same one-for-all approach: https://www.audkenni.is/, https://www.samleikin.fo/.
Things are a bit more fragmented in Finland, Norway and Sweden: https://www.norden.org/en/info-norden/electronic-identificat..., https://www.norden.org/en/info-norden/electronic-identificat..., https://www.norden.org/en/info-norden/electronic-identificat...
So, it's maybe not too much of a stretch to say that "a Copenhagen way" to authenticate is to integrate with MitID, either through a certified broker or by becoming one: https://www.mitid.dk/en-gb/broker/broker-certification/
It seems MitID isn't mentioned in The Copenhagen Book: https://www.google.com/search?q=site%3Athecopenhagenbook.com...
Iceland and the Faroes follow the same one-for-all approach: https://www.audkenni.is/, https://www.samleikin.fo/.
Things are a bit more fragmented in Finland, Norway and Sweden: https://www.norden.org/en/info-norden/electronic-identificat..., https://www.norden.org/en/info-norden/electronic-identificat..., https://www.norden.org/en/info-norden/electronic-identificat...
So, it's maybe not too much of a stretch to say that "a Copenhagen way" to authenticate is to integrate with MitID, either through a certified broker or by becoming one: https://www.mitid.dk/en-gb/broker/broker-certification/