We are new to Simple Practice and my question is related to our self-pay clients. We bill by the hour for those sessions. Typically they are only 1-hour sessions but occasionally people go over resulting in an additional 15 minutes or $25 charge. We have custom codes set up for those sessions, but will changing the appointment length on the calendar result in a change to the client invoice? If not, is there any automation for doing so or is it something that we will have to update manually? I'm also concerned if we squeeze a client in for 30 minutes if their invoice will generate as $50 charge or the full fee?