Fortnox
Fortnox — the Swedish SMB accounting standard: customers, invoices, supplier invoices, articles, orders, vouchers and the account chart. REST API v3, OAuth 2.0.
7-day free trial · No credit card · EU-hosted
Ask Fortnox anything
Try a real prompt against Fortnox via AnythingMCP — Claude calls the tools, returns the answer. Press Enter on your own message to install on Cloud.
Install Fortnox on CloudClaude is AI and can make mistakes. Please double-check responses.
Setup in 2 minutes
- 1Start a free trial on cloud.anythingmcp.com.
- 2Click Fortnox in the connector store. Paste credentials when prompted.
- 3Mint an MCP API key and point your AI client at the generated MCP URL.
Guides for Fortnox
Step-by-step setup for the most popular AI clients.
Setting up Fortnox
From the connector definition itself: where to find the credentials, what they need to be allowed to do, and which API this adapter talks to.
Setup
- Register at the Fortnox Developer Portal and create an integration. Add the redirect URI
https://cloud.anythingmcp.com/api/mcp-oauth/callbackon AnythingMCP Cloud, or<your AnythingMCP server URL>/api/mcp-oauth/callbackwhen you host AnythingMCP yourself, and enable the scopessettings,customer,invoice,supplierinvoice,order,articleandbookkeeping. You receive a client id and client secret. - Set
FORTNOX_CLIENT_IDandFORTNOX_CLIENT_SECRET, leaveFORTNOX_REFRESH_TOKENempty, and install. - Open the connector and click Authorize with Provider. Sign in with a user of the customer's Fortnox account, approve, and you land back on the connector page. AnythingMCP refreshes the access token on its own.
Scopes: settings customer invoice supplierinvoice order article bookkeeping, one per tool area. Fortnox scopes always grant read and write. The authorization URL carries access_type=offline, without which Fortnox issues no refresh token.
Already have a refresh token? You can paste it into FORTNOX_REFRESH_TOKEN instead of step 3, if you obtained it yourself for the same integration and have not used it since (see below).
The legacy Access-Token header is gone. Fortnox retired the old Access-Token + Client-Secret header pair; if you find an example using those, it is pre-2022 and will not work. OAuth 2.0 is the only path now.
Refresh tokens rotate. Fortnox issues a new refresh token on every refresh and invalidates the old one. AnythingMCP persists the rotated value back into the connector, but a refresh token you tested by hand, or share with another script, is spent and the connector fails with invalid_grant. Authorize again from the connector page to get a fresh one.
Rate limit is roughly 25 requests per 5 seconds per token, answered with 429. Pace bulk work.
Responses wrap the rows in the resource name: {"Customers": [...], "MetaInformation": {...}}. The paging totals live in MetaInformation (@TotalPages, @TotalResources).
financialyear matters for vouchers. Fortnox scopes bookkeeping to a financial year id; without one it uses the current year, which is a surprise in January.
Cloud reachability: api.fortnox.se is public with a valid certificate.
Your AI is two clicks away from Fortnox.
Install the connector, paste your credentials, ask your AI a question. 7-day free trial, no credit card.