Within the app MyUnbox, the merchant has the option to create a QR code to receive a payment from a customer who has Ucoins in their wallet. To create this QR code, simply press "Request Payment" and enter the number of Ucoins you want to receive for the purchase/order. Make sure you enter the amount of Ucoins equal to the euro value of the order.
Once you have entered that amount, you can press "Create QR code" and show this to the customer. The customer scans this QR code from their app and confirms the payment. After the payment is confirmed, you will get a "Success" screen indicating that the transaction was successful. Your balance reflects the Ucoins you accepted from the customer.