Buy now pay later giant Klarna has revealed a jump in sales over recent months after partnering with more retailers and making more money from loans and paying subscribers. However, the US-listed financial firm downgraded its outlook for the second half of the year amid a recent drop in its share price. Klarna recorded a 27% increase in revenues for the three months to the end of June, compared with the same period last year. 2 million merchants let customers pay with Klarna, which is 54% higher than the same period last year. Klarna charges a fee for retailers that offer its flexible payment options to customers at the checkout.