If you register a return, you can choose to give the money back or you can refund the amount in the form of a gift card, so that the customer can use this as a credit note. You will then also be able to check the remaining amount on the gift card.
Create a product for a Gift Card or Credit Voucher
Sell it as a normal product.
Go to Orders and find the relevant order.
Select Return and then Gift Card / Credit Voucher
When the customer wants to use the gift card or credit note, select At betale
Choose Credit Voucher and enter the code or scan the barcode.
A pop-up will appear showing the remaining balance.
If there is still a balance left on the card, a new receipt will be printed.