The tip function was added with Paymash version 1.2.25. So make sure that the latest Paymash version is installed on your device. For the following steps you only need a smartphone or tablet with the Paymash app on it.
First go to the Paymash settings.
Then select the menu item "General".
Below you will find the tip function which you need to activate.
Select a product which will then be automatically added to the shopping basket if someone wants to leave a tip.
TIP: Create a product named "Tip" and activate the free prize entry for it. This way you can always adjust the tip according to the customer's wishes.
The function is now activated and will be shown during the payment process. You can either add the tip and Paymash calculates the total or you can enter the total with tip and Paymash calculates the tip.