Step 1: Click on gear wheel icon (Settings) from the right top corner of the Jonas Synergy.



Step 2: Select "Register Setting" from the left row of the window, then click on "Custom Payment Method" tab.

Step 3: Under the "Custom Payment Method" tab, you can see list of existing created Payment Methods. If you want to modify or delete existing Payment Method, click Edit or Remove under action button. 

Step 4: If you want to create new Payment Method, click on "Add" button. Fill all the info, like Custom payment name and select Chart of Account from the list, then click on the "Save" button.

Once Custom Payment Method is created, you can see that Payment Method in Payment mode window, when you click on the Pay button to proceed the payment in POS.