Answer:
At the time of writing, you can apply to become an International NemID Service Provider. This is an agreement between you and Nets DanID, and has a greater startup cost than regular NemID, but behaves like any other NemID integration once onboarding is complete. Please note that the issuance process for the merchant certificate has a lot more manual steps than a regular NemID onboarding, so the process might take 3-4 weeks, all told.
See also this post: Are you planning on supporting MitID?
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