@John2156 I'm not sure you can access this info, but I could be wrong. Maybe someone else knows more about this.
I find that the nightly rate shows on the calendar until a guest books and then it will just show the total amount of the booking. On the message thread for the booking, you only see the number of nights x average nightly price. I would normally just use the average price for any refunds as I don't think the guest sees it broken down differently.