Need to integrate Gravity Forms with Appointment+

Hi,
I need to integrate Gravity Forms front end in front of appointment + to collect the user data and pass that onto Appointment+. Name, Email, Data, Time, Servie Provider and Service id essentialy. It is very critical for me. I looked at various topics but could not find a solution.
https://premium.wpmudev.org/forums/topic/gravity-forms-and-appointments

How can I achieve that.
Regards, Tkd