Choose which Fortnox price currency each Magento store should get its product price from.
Each row connects:
a Magento Store, and
a Fortnox Currency CODE, for example SEK or EUR.
Good to know
If you have more than the default website, the Price Scope in Magento must be set to Website (Stores » Configuration » Catalog » Catalog).
If the Default store is not set here, the first price is used.
If you only want the default price, and/or you import prices with the price (pricelist) flow, don't add other stores than Default.
The stores come from your Magento. If the list is empty, check that Magento is connected. An empty list almost always means the connection, not the setting.