FinansKlarna valuation crashes to $6.5bn from $46bnSwedish fintech’s decline highlights how investors are souring on ‘buy now, pay later’ sector.Klarnas chief executive Sebastian Siemiatkowski is describing 2022 as a «tumultuous year».Foto: Casper HedbergJames Fontanella-Khan (FT)Ortenca Aliaj (FT)Siddharth Venkataramakrishnan (FT)Arash Massoudi (FT)