I tried to implement a system like this once, with the goal being to reduce the amount of equipment and clutter on the service counter, but ran into issues of t

I tried to implement a system like this once, with the goal being to reduce the amount of equipment and clutter on the service counter, but ran into issues of trust. I learned very quickly that if you remove the cash from sight of the customer (even by turning around or having a cash register under the counter) you invite potential fraud from the cashier or the customer. The cashier is able to skim, or the customer to claim they gave a different amount if the money disappears, even briefly. I gave up on it and kept the standard "customer-facing register" setup.