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Start a free trial on cloud.anythingmcp.com, add the Fortnox in one click, then point your AI client (Claude, ChatGPT, Copilot or Cursor) at the generated MCP endpoint. No Docker, no git clone, zero engineering experience required.
Summary
Fortnox — the Swedish SMB accounting standard: customers, invoices, supplier invoices, articles, orders, vouchers and the account chart. REST API v3, OAuth 2.0.
Try asking
Example prompts for Fortnox
Click any prompt to copy it. Paste into Claude, ChatGPT, Cursor, Gemini, Copilot or OpenClaw to run it against this connector.
Claude is AI and can make mistakes. Please double-check responses.
💡 No install? Use cloud.anythingmcp.com directly. Sign in, click Connectors → Fortnox, paste your credentials, mint an MCP API key — done. No Docker, no
git clone, no local server.
Fortnox + ChatGPT
Fortnox — the Swedish SMB accounting standard: customers, invoices, supplier invoices, articles, orders, vouchers and the account chart. REST API v3, OAuth 2.0.
Prerequisites
See the full setup instructions baked into the connector (visible in the in-app store when you select the connector). The required environment variables for this connector are:
FORTNOX_CLIENT_ID, FORTNOX_CLIENT_SECRET, FORTNOX_REFRESH_TOKEN
Step 1 — Get credentials
Getting a token
- Register at the Fortnox Developer Portal and create an integration. You receive a client id and client secret.
- Run the authorization-code flow once for the customer's Fortnox account, asking for the scopes you need —
invoice,customer,article,order,supplierinvoice,bookkeeping,settings. Keep the refresh token. - Set
FORTNOX_CLIENT_ID,FORTNOX_CLIENT_SECRETandFORTNOX_REFRESH_TOKEN. AnythingMCP refreshes the access token on its own.
…(continued in the in-app connector instructions)
Step 2 — Install the adapter
curl -fsSL https://raw.githubusercontent.com/HelpCode-ai/anythingmcp/main/docker-compose.quickstart.yml -o docker-compose.yml
printf 'JWT_SECRET=%s\nENCRYPTION_KEY=%s\n' "$(openssl rand -hex 32)" "$(openssl rand -hex 32)" > .env
docker compose up -d
Step 3 — Add the connector in ChatGPT
Your server URL: in AnythingMCP, open MCP Servers → the server this connector is on, and copy its URL (
https://cloud.anythingmcp.com/mcp/…). Use it wherever this guide showsYOUR_SERVER_ID.
ChatGPT adds MCP servers as plugins on its Plugins page, on the web and on paid plans. Developer mode is no longer needed. In a Business workspace only admins and owners can add one; in Enterprise and Edu an admin can grant the Create plugins with MCPs permission.
- Go to chatgpt.com/plugins, click Add, then Add custom MCP server.
- Enter a name, e.g. Name:
Fortnox. - Under Connection, enter the Server URL
https://cloud.anythingmcp.com/mcp/YOUR_SERVER_IDand keep Authentication on OAuth. - Select I understand and want to continue, then Create as a plugin. When ChatGPT asks, sign in to AnythingMCP and allow access.
- Install the new plugin from your personal plugins, then type @ in a chat and pick it.
Available tools
| Tool | What it does |
|---|---|
fortnox_get_company_settings | Read the connected company's settings: name, organisation number, VAT number, address and currency |
fortnox_list_customers | List customers with their number, name, organisation number, address and payment terms |
fortnox_get_customer | Read one customer by their customer number, with addresses, delivery defaults, VAT settings and price list |
fortnox_list_invoices | List invoices with their number, date, due date, customer, total and balance |
fortnox_get_invoice | Read one invoice in full: every row with article, quantity, price and VAT, the totals, the payment terms and the balance outstanding |
fortnox_list_supplier_invoices | List supplier invoices with their supplier, date, due date, total and payment state — the payables side of the ledger |
fortnox_list_orders | List sales orders with their number, customer, date, delivery state and total, for the pipeline between quote and invoice |
fortnox_list_articles | List articles with their number, description, sales price, purchase price, stock quantity and unit |
fortnox_list_vouchers | List bookkeeping vouchers in a financial year with their series, number, date and description — the ledger underneath the documents |
fortnox_list_accounts | List the chart of accounts for a financial year with each account's number, description, VAT code and balance-carry setting |
fortnox_create_invoice | Create a customer invoice as an unbooked draft: customer, dates and rows |
fortnox_list_attachments | List the files attached to one invoice, order or offer: attachment id, fileId and whether the file goes out with the document… |
fortnox_attach_files | Attach files that are already in the Fortnox inbox or archive to one or more invoices, orders or offers, optionally to be sent with the… |
fortnox_detach_file | Detach one file from its invoice, order or offer by attachment id; the file itself stays in the Fortnox archive |
fortnox_list_inbox | List the files and sub-folders of the Fortnox inbox (Inkorgen) or of one of its folders, with each file's Id, Name, Size and ArchiveFileId |
FAQ
Does the free ChatGPT plan work with custom MCP servers? OpenAI documents custom MCP servers for paid plans only; the Free plan is not on its list.
Next steps
- Connector landing page
- Connect to Claude
- Connect to Cursor
- Connect to Gemini
- Connect to Meta Muse
- Connect to Microsoft Copilot
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