Surfpay supports card present refunds, where the same card needs to be used. If you have to perform a refund for a Swish, cash or another payment method transaction, it will be a manual check by you. If it's for a card transaction however, the PIN app will be used. You select the transaction you'd like to refund from either the Transaction list in the Sales tab, or from the shortcut "Refunds" on the Shack page.
Click on the Refund button in the bottom of the transaction and follow the steps presented on the screen. It will be experienced just like when the transaction was made for the user, but with the headline "Refund" instead and that you cannot choose the amount yourself. The refund is always done for the full amount. We are working on supporting part refunds.