My clients would need their clients to be able to book anywhere between a 1 hour session to a 3 or 4 hour session. They should be able to just drag a slider or select multiple time frames so they can book a 3 hour sessions for example and the calendar would also show an optional amount to be paid so if they book one hour of therapy it would cost $100, 3 hours $300 etc.. then they can make the payment using stripes. it would also be great to be able to deliver a different price as they slide so 1 hour is $100, 2 hours is $200 but when they reach to 3 hours they get a discount so the price owed would be $250 etc... as they go up in hours booked