Does Apideck support Fortnox?

Yes, Apideck supports Fortnox through the unified Accounting API. Connect to Fortnox alongside 12+ other accounting software through a single integration, including Exact Online, FreeAgent, Twinfield.

How do I integrate with Fortnox?

Apideck supports Fortnox through the unified Accounting API. Sign up, enable Fortnox in your Vault, and use one standardized data model to read and write data. The same code works with 12+ other platforms.

Supported (beta)

Fortnox

Q: What is Fortnox?

Fortnox is a accounting software platform. Dominant Swedish cloud accounting platform, used by 500,000+ companies. It is popular in Sweden.

Last updated August 25, 2026

Dominant Swedish cloud accounting platform, used by 500,000+ companies

Companies that use Fortnox alongside other business software often need to sync data between systems. Common scenarios include syncing invoices, payments, customers, and financial reports with other tools in their stack.

Apideck's unified Accounting API provides a standardized way to integrate with Fortnox and 12+ other accounting software. One integration, one data model, every platform.

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Fortnox integration resources

Guides, API references, and resources for integrating with Fortnox

Fortnox integration

API reference, supported resources, and auth setup

Accounting API

Unified API reference for all accounting software

Invoices API

Read and write invoice data

Payments API

Sync payment records and transactions

Customers API

Manage customer and contact records

How to Integrate with the Fortnox API

Complete guide to Fortnox API integration: OAuth 2.0 auth, invoice and payment endpoints with code examples, pagination, rate limits, and webhooks.

Common Fortnox integration use cases

These are the most common reasons companies integrate with accounting software like Fortnox

Accounts payable automation

Sync invoices, bills, and payments between your product and your customers' accounting software. Eliminate manual data entry and reduce errors.

Revenue recognition

Automatically post revenue entries, manage deferred revenue, and keep your customers' books in sync with actual transactions.

Expense management

Push expense reports and receipts directly into accounting platforms. Categorize spending and reconcile automatically.

Financial reporting

Pull real-time financial data for dashboards, analytics, and compliance reporting. Balance sheets, P&L, and cash flow on demand.

Why use a unified API for Fortnox?

Instead of building and maintaining a direct Fortnoxintegration, use Apideck's unified Accounting API to connect to Fortnox and 12+ other accounting software through a single integration.