The service account will be responsible for bookings and the booking invitations will appear in the primary calendar.
To create a service account:
Log in to your admin account and go to Google Admin at admin.google.com, then click on Add a user.
Fill out required fields
Click on Add new user
This account will be used for Calendar integration. That means any new events created in MeetingRoomApp will be organized and created by this user in Google Calendar.