Exporting of "Key Reference Numbers" assigned for confirmed appointments in ZOHO Calendar?

Exporting of "Key Reference Numbers" assigned for confirmed appointments in ZOHO Calendar?

I am an application developer very interested in using ZOHO Calendar embedded in my client's web site.  My demo app with the embedded ZOHO Calendar using the "event requisition" feature for appointment scheduling is ideal and functioning perfectly ... however - I am also required to develop a Customer Login Page and I would very much like to know if the unique appointment "Key Reference Number" assigned for each event/appointment by ZOHO Calendar can be exported into a data base or ascii text file to Implement it as the Login "Password" for the Customer to access his Appointment Status and Data on my Web Site?

Thanks.