To create an invoice fee for Klarna KPM (invoice) orders, you need to create a new product in the store with the
- Provide a proper name, e.g: Invoice fee
- Make sure to assign a quiet high quantity for this article, e.g: 99999999
- Submit the price for the fee in the price field
- Make sure the product is active and visibility is set to "nowhere"
- It's very important that this product has the same reference code as you've submitted in the Klarna
Official-module under tab KLARNA PAYMENT METHOD (KPM) - field: "Invoice fee product".