The Klarna Payments API provides a way to create a session to offer Klarna's payment methods as part of your checkout. After the purchase is complete, the order should be handled using the Order Management API. The three payment methods that it uses are; Pay now, Pay later and Slice it. It offers consumers with the ability to try before you buy, finance purchases on your store, or make use of other Klarna payment options. Klarna is a global tech bank that provides services for payments and shopping.