Thanks.

More precisely, what we are attempting to do is to write a stand alone API that will be scheduled to run daily. It will search our class rosters based on X number of days until they start of the class or Y number of days after the class has completed and send all registered students an Invitation to take a survey using Checkbox 4.3 services. We would like to use the Checkbox Invitation Manager to send and track emails. We do not see this option available on any of the provided Web Services provided to us.