How to refund SumUp payments.
To refund a transaction tendered through SumUp tap on the red 'History / Refund' button at the top of the screen. If the transaction was made within the last 24 hours you will be able to select it from the list of transactions that appear when you press the red 'History / Refund' button otherwise enter the transaction number from your customer's receipt in the search box.
The transaction will appear in the cart. Tap on the 'Refund' button at the bottom of the cart. In the refund popup select 'SumUp' and press 'Refund'. The refund is done using the SumUp API (Application Programme Interface) and will appear in the customer's account within a few working days.