For more information on "Pay in 30 days" please see https://www.klarna.com/uk/customer-service/how-does-pay-in-30-days-work/
For more information on Klarna payment options, please see https://www.klarna.com/uk/customer-service/csc/products-services/payment-options/
For general information on Klarna customer service, please see https://www.klarna.com/uk/customer-service/