I've seen this one floating around but havent seen much movement as the teams seem to be very busy but I'd like to pop this back into the workflow and get eyes on it again.
Massive update needed to allow the use of coupon codes directly in calendars when people book appointments. Now in the case that a client requires a deposit, have the coupon code either remove the deposit (free service coupon code) or take the discount code from the deposit / deposit + total service price if required.
Gift certificates / gift cards would also be MASSIVE!
Thank you legends