There was a problem with the standard Klarna payment module.
When trying to make an order with payment through this module, an error is shown to the user, and an error is written to the log file:
Failed to create an invoice for order # 799. Message: Det har uppstått ett integrationsfel mellan butiken och Klarna. Kontakta Webbutiken för mer information eller välj ett annat sätt att betala. Code: 9113
Store Version 3.0.2.0
I already tried replacing files from 3.0.3.2, but that didn't help.
Ready to pay for the work.