To apportion the tip the customer scans a QR on the receipt, opens a slider where the patron scores service 1-10

Lower the score more goes to the overall pot, higher the scale more to the specific server, boundaries are set at either extreme and default of 5 or no response

Lots of behavior changes implied there but it is well-aligned, patron still gets to feel good about themselves when sliding that puppy up to 10... its also an opportunity for the restaurant to link happy people to google reviews