Purchased tickets through Ticketmaster are non-refundable. This also applies when you have chosen Klarna as payment method. If the event is cancelled, the ticket is refunded according to the promoter's guidelines and within 60 days after the date of the event. The service charge is not refundable.
In some cases, Ticketmaster's Fan Guarantee will provide an opportunity to cancel/refund a purchase within 24 hours after the purchase. Please note that there are some exceptions.