:payment_method_category :: :string

The Klarna payment method used for this transaction. Can be one of pay_later, pay_now, pay_with_financing, or pay_in_installments

:preferred_locale :: :string

Preferred language of the Klarna authorization page that the customer is redirected to. Can be one of de-AT, en-AT, nl-BE, fr-BE, en-BE, de-DE, en-DE, da-DK, en-DK, es-ES, en-ES, fi-FI, sv-FI, en-FI, en-GB, en-IE, it-IT, en-IT, nl-NL, en-NL, nb-NO, en-NO, sv-SE, en-SE, en-US, es-US, fr-FR, or en-FR