Key Takeaways Klarna's planned $14B U.S. IPO rattled Affirm shares' growth despite its strong fiscal Q4 results.Klarna boasts 111M users and$31.2B GMV, while Affirm logged 23M users and $10.4B GMV.Affirm is pushing global growth, expanding in Europe through its Shopify partnership and U.K. success.The buy now, pay later (BNPL) arena is getting a lot more interesting as Klarna, the Swedish payments firm, is heading for Wall Street with a U.S. IPO that could value it around$14 billion. For Affirm Holdings, ...