"Buy-now, pay-later" firm Klarna aims to return to profit by summer 2023.Jakub Porzycki | NurPhoto | Getty ImagesKlarna has agreed a major new distribution partnership with fellow fintech unicorn Stripe, in a bid to expand reach and add more merchants in the lead-up to its upcoming listing in the U.S.Klarna's buy now, pay later (BNPL) service will become available as a payment option for merchants using Stripe's payment tools in 26 countries, the two companies told CNBC Tuesday.This isn't the fi...