Code some Google Calendar integration with my PHP site (hoprem)

We have an existing PHP site with a MySQL database. We would like some modifications made to a few of the files which are currently integrated with Google Calendar. At the moment, these files create an event in a specific Google Account's calendar. However, we need this to be dynamic, based on who the event is assigned to within the system. Please read the attached document for full details and instructions, and feel free to ask any questions. You will be given full FTP and Cpanel access.