get https://example.com/consumer/v1/appointments/customfields
This end point returns your Appointment custom field definitions.
Appointment custom fields are different than Customer custom fields. Appointment custom fields are
stored with each appointment. They are used when the information collected during the booking is specific
to a particular visit.
Use the field, and type to determine how to update field values
in PUT /consumer/v1/appointments/customfields
For more information see Appointment booking fields