Altinn system user / Access Management

Altinn III system-vendor API for access packages — KETL ↔ the customer's Altinn permissions.

Lets KETL act on behalf of customers based on approved access packages — Altinn II hard cutoff on 19 June 2026. Exposes query/create flows for system-user registrations; requires Maskinporten token exchange with the scopes altinn:authentication/systemuser.{read,write}.