Not OP but if you added the British Crown Dependencies (Channel Islands, Isle of Man) you would have some very happy clients here. These aren't the biggest markets and they are frequently ignored. However some larger tech companies like AWS, OVH, and DigitalOcean do serve this market and correctly handle our UK VAT exempt status. Fingers crossed...

I'm interested in the nordic countries especially norway and denmark where nets are the most used payment provider.

One business case is that I'm currently working for a company with a fairly large public email service. We have a lot of difficulty handling subscriptions on our current payment provider "epay" who like you is an abstraction on top of the card procider nets.