Official Sites
Nemhandel - https://nemhandel.dk/
OIOUBL is the Danish adaptation of the international UBL 2.0 from the standardization body OASIS.
A technical introduction to NemHandel
PEPPOL
OIOUBL
PoRS2
PoRS2 is the 2nd generation of the PoRS service (Profile Oriented Registration Service). Via PoRS2 it is possible to maintain (create, update and delete) data in NHR.
Access to PoRS2 is granted using a OCES2 certificate (FOCES or MOCES) - please see http://registrationservice-test.nemhandel.dk/nemhandel-pors/info/ for an introduction to PoRS2.
http://registrationservice-test.nemhandel.dk/nemhandel-pors/Introduction-to-NHR-PoRS2.pdf
Existing Solution Providers?
https://www.360cloudsolutions.com/products/netsuite-integrations/b2bgateway/