Hi Viktor,
Thanks for getting in touch!
I have to honest and say I have never heard of or used Klarna Checkout.
That said, I can say with confidence that we have not tested it out on our own. What we do offer is a full refund on all our products within 30 days of purchase. That should give you a good amount of time to try it out and see if it will integrate well for you. And, of course, if it doesn’t we’d be happy to honor our refund policy as long as you request it within 30 days of purchase.
Sorry I don’t have a definitive answer for you, but does this at least help? Please let me know. 🙂
Cheers!
Geoff