For more information on "Pay in 3 instalments" please see https://www.klarna.com/uk/customer-service/what-is-buy-now-pay-later-and-how-does-it-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/