Starting from version 6.21.09.17, you can configure the available payment methods per device. Let’s say that you only have 1 POS with a credit card terminal attached to it, you can hide this payment method from the other POS devices. To do this, go to Settings => System => Environment => Devices. Double-click the device you want to edit, and go to the tab ‘Payment methods’. Here you can enable the payment methods that you want to show on this device.
Then when you try to pay a bill on this device, only the selected payment methods will be available.