A: By default, Upsales synchronises the discount on each order row to Fortnox as an amount.
In the Fortnox Premium app, you can synchronise it as a percentage instead. Open the app's settings and, under Extra fält → Order / Faktura, check Synka rabatt som procent istället för summa. This only changes how the discount is shown in Fortnox. The order in Upsales is not changed.