STOCKHOLM—Klarna said it will become the exclusive buy-now-pay-later provider at Walmart in the U.S., replacing rival Affirm as the Swedish fintech company nears a potential initial public offering.Stockholm-based Klarna said Monday that it will work with Walmart-backed consumer finance app OnePay to offer customers installment loans on purchases at the retailer.

BofA Securities analyst Jason Kupferberg said the decline in Affirm Holdings (AFRM) stock after a new Walmart/Klarna partnership is overdone, and Affirm should be able to manage any potential loss in business.

Affirm Holdings will lose its exclusive role providing installment loans for Walmart as Klarna partners with OnePay. Yesterday, Goldman Sachs analyst lowered AFRM's price target from $90 to $50, then raised the forecast to $56 reflecting the updated impact of loss of the Walmart relationship.