Klarna cannot currently be used as a Shopify accelerated/express checkout (fast checkout buttons in cart/checkout) or as a supported Klarna Express Button within Shopify. There is no timeline or ETA; enabling this is up to Shopify, though Klarna states it’s a top priority and requests merchants keep sending feedback to Shopify.
Interim options:
Pricing/commissions: Klarna takes standard payment processing fees when customers choose Klarna at checkout. Questions about affiliate‑style commissions (e.g., 17%) weren’t resolved; merchants were directed to Klarna Business Support for specifics.
Issues reported: A “Sorry, something went wrong” popup when attempting an express button in a minicart was redirected to another thread; an app install error (“failed request with status code 404”) was reported without an in‑thread fix.
Status: Unresolved and ongoing; key open question is when/if Shopify will allow Klarna Express Checkout.
As of 2022-Dec-15, our Klarna on-site messaging app (https://apps.shopify.com/klarna-on-site-messaging) now supports Shopify Plus merchants adding placements within checkout: https://docs.klarna.com/platform-solutions/shopify/on-site-messaging-app-for-shopify/install-steps/#add-placements
Not on par with Klarna available as an accelerated checkout, but still an improvement!