The separate checkout included in the Klarna payment service, at which the customers can select the desired Klarna payment method.
The Klarna Checkout templates cannot be used with the new Klarna Checkout v3.
However, you can customize the colors used in the new checkout.
Klarna Checkout was updated to the new v3 version in all MyCashflow online stores on 15 December 2020.
To use the checkout provided by Klarna Checkout, you must enable Klarna Checkout in your online store.
You may want to select Klarna Checkout as your online store's default payment method so that your customers are always directed to the Klarna checkout first.