About Klarna Payments
Klarna Payments is a payment service that includes Klarna's Pay instantly, Pay later and Slice it -payment methods. You can order it from Klarna's sales, and they'll give you the required API credentials for installing the payment method to your online store.
Adding Klarna Payments to your online store
You can add Klarna Payments by following these steps:
Click Open next to the Klarna app. (If you don't see the Klarna app, install it first by following the instructions on the How to use apps article).
Click Manage on the Klarna payments section.
Click Go to settings.
You will be redirected to your online store's payment method settings.
Choose I already have credentials.
Fill in the credentials that Klarna gave you and save settings.
After you have added Klarna payments to your store, it's good to make one test purchase using Klarna. By doing that, you can be sure that the payment method is installed correctly.