Guides
One page per question, each answering it in the first paragraph. These guides cover integrating with Norwegian government systems: Altinn 3, Maskinporten, the Brønnøysund registers, and the obligations and deadlines that follow from them. They say what is live today rather than what is planned.
Integration
Authentication and authority
- How does Altinn System User delegation work?
- How do I authenticate against Norwegian government APIs?
- How do I verify company signing authority (signaturrett) via API?
- Which token do I need, Maskinporten or Altinn, and how do I exchange one for the other?
- How do Altinn 2 roles map to Altinn 3 access packages?
- Which credential do I need: virksomhetssertifikat, virksomhetsbruker, systembruker, or a Maskinporten client?
- How do I set up an Altinn system user from scratch, from registration to first token?
- How does client delegation work for accountants and auditors in Altinn 3?
- Who can legally sign for a Norwegian company?
- What is the difference between prokura and signaturrett?
- What differs between Altinn TT02 and production?
AI agents
- How can AI agents safely access Norwegian government services?
- How do I connect Claude or Cursor to Norwegian company data using MCP?
- Can an AI agent query and interact with Altinn APIs?
- How do I build compliant AI agents for Norwegian businesses?
- How do AI agents get Norwegian company facts without hallucinating?
- How does an AI agent verify a Norwegian company?
Company registry data
- How do I access Brønnøysund Register Centre data through a REST API?
- How do I fetch updated Norwegian company registry data via API?
- How do I programmatically check if a Norwegian company is active and registered?
- How do I perform automated Norwegian company KYC and due diligence via API?
- How do I access Norwegian annual accounts (årsregnskap) data via API?
- How do I check if a company is registered in the Norwegian VAT register (Merverdiavgiftsregisteret) via API?
- What do the company roles in Brønnøysundregistrene mean?
- How do I check if a Norwegian company is bankrupt?
- How do I check if a Norwegian company is deleted from the register?
- How do I look up a Norwegian organisasjonsnummer?
- How do I check a Norwegian supplier before paying an invoice?
- What is Brønnøysundregistrene?
- What is KYB and how does it work in Norway?
Compliance and deadlines
- How do I automate Norwegian regulatory compliance tasks?
- How do software platforms calculate MVA and A-melding deadlines automatically?
- How do I query compliance obligations for Skatteetaten via API?
- How do accounting and bookkeeping platforms integrate with Altinn and Norwegian public registers?
- How do AI agents ensure compliance with Norwegian bookkeeping laws (bokføringsloven)?
- Which filing deadlines does a Norwegian AS face in 2026?
- When are Norwegian annual accounts due and what does late filing cost?
- When is aksjonærregisteroppgaven due and who must file it?
- What are the Norwegian MVA deadlines in 2026?
- When is the a-melding due each month?
Troubleshooting
Why this is hard
Cost and durability
Where to go next
Every answer above rests on an API you can call today. The endpoint reference documents the request and response shapes, the sandbox lets you rehearse a call without a key or a government round-trip, and the price list says what each call costs before you wire anything up.