If you selected Klarna Invoice, then the invoice will be adjusted if you have returned the entire order. If you only returned part of the order, you will receive an updated invoice from Klarna. Please note that shipping costs are not refunded.
If you paid by card, the refund will automatically be issued to the card used for the original purchase.
If you paid with a PayPal, the refund will automatically be issued to your PayPal account. By signing in to your PayPal account you can choose if you want to keep the money on the PayPal account or transfer them to your bank account.