List and filter invoices. Supports filtering by status, date range, and pagination.

Get full details of a specific invoice by its document number.

Create a new invoice for a customer with line items.

Send an invoice to the customer via email.

Check payment status and history for a specific invoice.

Search and filter the customer database.

Get full details of a specific customer.

Add a new customer to Fortnox.

List incoming supplier invoices (bills/expenses).

Get details of a specific supplier/vendor.

Record a new supplier invoice (expense/bill).

List journal entries/vouchers. Optionally filter by financial year.

Create a manual journal entry (voucher). Rows must balance (total debit = total credit).

Get the chart of accounts. Useful for finding account numbers for bookkeeping.

Get information about financial/accounting years.

Get company information and settings from Fortnox.

List all projects for tracking time and costs.

List cost centers for allocating expenses across departments or projects.

List and filter sales orders.

Create a quote/offer for a customer.