Until now, I have always accepted full payment for sessions the day of the session, usually after the photos were taken. I am in the process of scheduling a maternity session and a newborn session in advance for the same client. She is paying me 50% of both sessions right now. Then, the other half of each session the day it is held. She asked if there is a receipt or or contract I can send after she makes the payment and I said "absolutely!" but..I really am not sure what I need to send her! Any help would be very appreciated.