Swedish fintech firm Klarna will be the exclusive provider of buy now, pay later loans for Walmart, taking a coveted partnership away from rival Affirm, CNBC has learned.

KEY TAKEAWAYS Affirm shares are tumbling Monday after rival Klarna, which is preparing to go public in the U.S., said it is now the exclusive provider of Buy Now, Pay Later loans for Walmart.Klarna said it would be partnering with OnePay to provide Walmart consumers with installment loans.

Klarna Group Plc is partnering with Walmart Inc.-backed OnePay to offer buy-now-pay-later to US shoppers, replacing Affirm as the retail giant’s fast credit option. Most Read from BloombergICE Eyes Massive California Tent Facility Amid Space ConstraintsHow Britain’s Most Bike-Friendly New Town Got BuiltThe Dark Prophet of Car-Clogged CitiesWashington,