First, you have to download and install the Sumup app on your device. Then connect the SumUp app with your SumUp account.
When you make a sale in the Loyverse POS app and choose SumUp as the payment type, SumUp will open to process the payment through the SumUp reader.
Loyverse POS app on iOS devices has had integration with SumUp terminals from before. Now, you have the possibility to add tips when accepting card payments through SumUp.
You can configure the tips that will be displayed on the POS when you set the SumUp payment method in the Back Office.
During the sale, the cashier can select the tip amount desired by the customer by selecting one of the predefined tip amounts on the Loyverse POS.
Details here: How to Add Tips to Payments Made through Card Readers