To use the Pay in 30 Days option, you must reside in Belgium, be older than 18 and have a valid payment card. By "valid payment card", Klarna means that the card must be in your name and must not have expired. You must also make sure that the card you are using has enough funds
to cover your payment. The Pay in 30 days option is a credit solution. It's Klarna who decides whether or not to enter into a credit agreement with you.