The Klarna Open Banking API is a server side service that offers endpoints for the merchant to initiate and control transfer and data access procedures. It is a single API that connects you to banks in European markets, that provides Account information and Payment initiation. This API is authenticated using the OAuth2 authorization system, and exposes endpoints for session and flow management. Requests are supported for PUT, DELETE, GET and POST and returns JSON formatted data. Klarna is a global tech bank that provides services for payments and shopping.