Does anyone use a client online booking system? ie the client books the day and time in our calendar? I am looking for one tht integrates with Max and can also sync with our Google calendar. Thanks 
I use and really like AppointmentCore.
It has a very tight direct integration with Max Classic.
Feel free to book/cancel using my calendar to see how it works.
https://4spotmarketing.com/schedule-appointment/
The other main system we have client using is Calendly.
Thanks,
Jeff