If you don't make your payments you will be in arrears as Pay in 3 is a credit product. Klarna may then share information about your missed payments with credit reference agencies. This means you may find it difficult or more expensive to use Klarna or other lenders' credit products in the future. Klarna may also refer any debt to a debt collection agency. This agency will collect the debt on behalf of Klarna. Also, if the debt is referred to a debt collection agency Klarna will share this information with credit reference agencies.