Connect Claude to your Fortnox.
First the service is bought in the Fortnox App Market, by you or your administrator. Then you add it to Claude, which takes about five minutes.
Already know how?
Add the address as a custom connector.
https://accounting.amore.cloud/mcpBefore you start: Add the connector on claude.ai in a browser — it then appears in the desktop app and on mobile too. The free plan is enough, but there you can have only one custom connector.
- The service is bought and activated for the right company in the Fortnox App Market. Buying and activating are two separate steps.
- A system administrator of the company's Fortnox does the sign-in. Fortnox requires it.
- BankID, or whatever else you sign in to Fortnox with, is at hand.
- Pop-ups are allowed. The Fortnox sign-in often opens in a window of its own.
- Ten minutes in one go. The Fortnox sign-in must be finished within ten minutes, and you must be back in Claude within ten minutes of the last step.
Not bought yet? How to buy in Fortnox.
Two parts, a few minutes.
Open Customize
You find Customize in the left-hand menu.
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Choose the Connectors tab
It is one of the tabs at the top, beside Skills. The page opens on Discover with Claude's own connectors — yours are under Yours.
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Click Add and choose Add custom connector
Add is top right.
Stuck on this step?
Add custom connector is greyed out or missing. On Team and Enterprise the organisation's owner (Owner) adds custom connectors, under Organization settings → Connectors. After that the connector is in the list on your Connectors page — click Connect there and carry on with part 2. On the free plan you can have one custom connector, so remove another first.
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Fill in name and address
Enter a name such as More, paste the address below and click Continue.
https://accounting.amore.cloud/mcpStuck on this step?
Claude says the address is already in use. A colleague got there first and added the connector already. Cancel, find it in the list on the Connectors page and click Connect.
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Choose how Claude signs in
Claude checks the address and has usually already chosen Sign in now under Authentication and Register automatically under OAuth client — both marked Detected. Leave them. Do not choose Use Claude's published identity, and leave the client ID, secret and request header fields empty — the service registers the connector for Claude, and you should never paste a Fortnox secret there.
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Click Add, then Connect
The connector is added. If the sign-in does not start by itself, click Connect on its page.
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Claude opens our consent page
The page is in Swedish. It shows which app wants to connect and what it asks for. Tick Ge skrivrättigheter till bokföringen (give write access to the bookkeeping) if the assistant should be able to propose changes — without the tick it can only read, and you can change it later without reconnecting. Din e-postadress (frivilligt) is your email address, and it is optional.
Stuck on this step?
The page says the Fortnox sign-in was not completed. On screen: Inloggningen hos Fortnox slutfördes inte. The sign-in was cancelled, or was not finished within ten minutes of starting. Start again from the app; the second attempt goes faster.
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Sign in to Fortnox
Fortnox opens, headed Logga in i Fortnox (Sign in to Fortnox). Sign in as usual, for example with BankID. The sign-in is done by a system administrator of the company's Fortnox — that is Fortnox's requirement. If you are already signed in, this step is skipped. Your password never passes through us.
Stuck on this step?
Fortnox says a system administrator is missing. The person signing in is not a system administrator of the company's Fortnox. Ask a system administrator to do this step with you, or to give you that role under Inställningar → Användare (Settings → Users) in Fortnox, then start again from the app.
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Choose the company
Under Välj företag (Choose company), choose the company the assistant should work with. You can add more companies in step 5.
Stuck on this step?
It says the licence is missing. The service is not bought or activated for that company. Buy and activate it in the Fortnox App Market — here is how — and start again. Reconnecting without buying does not help.
The company I want is not in the list. The list shows the companies your Fortnox user can access. If the company is missing, an administrator there needs to give you a user in it.
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Approve in Fortnox
Fortnox shows what the service may use. Click Godkänn & aktivera (Approve & activate) — you then come to our page showing that the company is connected.
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More companies, then back to the app
Our page (in Swedish) shows which company is connected. If the service is bought in other companies too, you can bring them in straight away: click Lägg till ett bolag till (Add another company), sign in to Fortnox again and choose the next company. Tick the box there if the assistant should be able to propose changes in that company. Then click Tillbaka till Claude (Back to Claude) within ten minutes — the connection is complete only once you are back in the app.
Stuck on this step?
The page says the time to add more companies ran out. On screen: Tiden för att lägga till fler bolag gick ut. The connection was not completed in time. Start again from the app. You can add more companies at any time afterwards — ask the assistant for a link.
Do all companies have to come along now? No. One connection holds up to 50 companies, and you add the rest later by asking the assistant for a link. The link is valid for fifteen minutes.
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Let Claude read without asking every time
Go back to the connector's page: Customize → Connectors → Yours → More. Under Tool permissions, set Read-only tools to Always allow (the tick). Leave Write/delete tools on Needs approval — Claude then asks only when something is to be changed or uploaded, and every change is also shown to you before it is sent.
Stuck on this step?
I skipped this step. Do it whenever you like. Or choose Always allow rather than Allow once the first time Claude asks about a reading tool in the chat.
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Ask about your company
Open a new chat and check under the plus sign in the message box, under Connectors, that the connector is switched on. Then ask, for example, "Use More: how many unpaid customer invoices do we have?". Reads now run straight away. If you ask for a change, Claude asks permission before it is sent — that is intended. The first time, Claude also offers examples of what you can ask.
Stuck on this step?
A new tool does not appear. Claude stores the tool list when you connect. Refresh tools list sits under the three dots on the connector's page; choose it, then carry on in a new chat.
The warehouse does not show, although we have Fortnox Warehouse. A connection made before 8 October 2026 lacks the warehouse permission, and the warehouse requires the company to have the module. Reconnect in Claude, then add your other companies again.
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Claude changes its interface often. The steps were last checked on 10 October 2026.
Not working? Troubleshooting covers what we have seen most often.