Region: Base url region (For playground eu https://docs.klarna.com/klarna-payments/api/payments-api/#tag/API-URLs). Supported 'eu', 'us', 'oc'
Playground: Propertie defining if connector is used against playground or production environment
Username: Consists of your Merchant ID (eid) - a unique number that identifies your e-store, combined with a random string (https://developers.klarna.com/api/#authentication)
Password: A string which is associated with your Merchant ID and is used to authorize use of Klarna's APIs (https://developers.klarna.com/api/#authentication)