Klarna Docs - Uninstall

To remove Klarna from your Shopify checkout, deactivate the alternative payment method (under Settings-> Payments).

After deactivating a payment method, you are given the option to remove the corresponding payments app, but we do not recommend removing the app until all Klarna orders have been finalized. The app supports order management updates (e.g. refunds) from Shopify to Klarna.