Possibly buttons side by side, one "Collect Gratuity and Charge" and "No Gratuity, Only Charge". We have quite a number of clients who tip outside of Blvd or provide cash (or gift cards), it currently is an awkward and ~15 second task of explaining to client to click no tip then pay. This is easy for our spry clients, but for our less so clients this hold up is very confusing and causes awk-delay.