Who the connected Fortnox company is (name, org number, address, VAT number), its financial years, and the locked period (the date through which the books are closed). Call this first to orient.

All financial years (räkenskapsår) with id and date range. The id is what SIE and voucher calls take.

Customer invoices (kundfakturor), newest first unless sorted otherwise. Filter by status (unpaid, unpaidoverdue, fullypaid, unbooked, cancelled), invoice date range and customer. Total includes VAT; Balance is the amount still unpaid according to Fortnox.

One customer invoice in full: rows, Net (excl. VAT), VAT, Balance, due date, references, booked/sent state.

Payments registered against customer invoices (inbetalningar). Optionally for one invoice.

Supplier invoices (leverantörsfakturor). Filter by status (unpaid, unpaidoverdue, fullypaid, unbooked, cancelled, pendingpayment, authorizepending = awaiting attest), date range and supplier.

One supplier invoice in full, with its accounting rows. given_number is Fortnox's own serial number for it.

Customer register. Search by name, org number or email.

One customer in full: addresses, terms of payment, VAT type, default references.

Supplier register.

One supplier in full, including bank details as registered in Fortnox.

Article (product/service) register with prices and stock.

Customer orders. Filter invoicenotcreated shows orders not yet invoiced.

Quotes/offers (offerter).

Projects, used to tag invoices, vouchers and costs.

Cost centers (kostnadsställen).

Chart of accounts (kontoplan) for a financial year, with opening (BalanceBroughtForward) and closing (BalanceCarriedForward) balances.

Vouchers (verifikationer) by date range or series. Rows are not included; use get_voucher for one, or the report tools for totals.

One voucher with its debit/credit rows.

Profit and loss for any date range, grouped by BAS account class with per-account lines: revenue, goods, external costs, personnel, depreciation, financial items, tax. Revenue positive, costs negative. Built from the SIE export, so it matches the books exactly, including manual vouchers.

Assets, equity and liabilities on a date, per account, plus the year's result not yet closed to equity. Cash and bank are the 19xx accounts.

Monthly net movement for an account range, e.g. 3000–3999 for revenue per month, 5000–6999 for external costs, 7000–7699 for personnel, 1930–1930 for the business account. Revenue accounts (3xxx+) are sign-flipped so income reads positive.

Unpaid customer invoices bucketed by days past due (not due, 1–30, 31–60, 61–90, 90+), per customer, with the most overdue invoices.

Unpaid supplier invoices bucketed by days past due, per supplier, with the most overdue.

Search the read-only Fortnox endpoints fortnox_get can call (assets, contracts, employees, salary, time, warehouse, price lists, currencies, …). Returns path templates and summaries.

GET a Fortnox API path that matches one of the templates from list_endpoints, with {placeholders} filled in, e.g. /3/assets or /3/employees/12. Read-only: nothing that sends, prints or changes data is reachable.