Gets a list of private corporate bookings for an employer, that overlap a date range. 

After obtaining a booking, the employer's employees enrolled into that booking can be obtained by using the GetEmployeeEnrolmentsForEmployerEnrolment function. 

Each booking is represented by a TBooking. The list of bookings is represented by a List of TBooking in the BookingList property in the returned TAuthBookingList. 

A token is passed for authentication. If the authentication fails, or other errors occur, no data will be returned. The result of the authentication is represented by a TAuthenticate object. 

Requires a valid registration key entry for the Bookings feature. 

This function has security level "Protected", and can only be accessed by users that have explicitly been granted permission to the API.

[WebMethod(Description = "Gets a list of private corporate bookings for an employer overlapping a date range")]
public TAuthBookingList GetBookingsForEmployer(string token, string employerIdentifier, DateTime startDate, DateTime endDate);