We would like to see a customer facing screen be able to connect to the 20 inch kiosk so the customer can see what they are being rung up for, can add a tip, etc.
That's an interesting setup. Out of curiosity, could you share more about why you want a GFD on the kiosk? Customers can already review the items in the cart before payment, so adding a GFD to the kiosk feels somewhat redundant.
I believe the 20” has the proper connections for a gfd behind one of its little rear covers, and you would make a change in device setup as well as a change in the back end. I have seen this set-up before in toast retail for a vision-challenged client however I did find that the guest placing display only acted as a screen mirror and did not have the same level of interaction that a guest facing display has when connected to a flex
