The event the webook responds to. This should be one of the following: peopleCreated, peopleUpdated, peopleDeleted, peopleTagsCreated, peopleStageUpdated, peopleRelationshipCreated,peopleRelationshipUpdated,peopleRelationshipDeleted, notesCreated, notesUpdated, notesDeleted, emEventsOpened, emEventsClicked, emEventsUnsubscribed, tasksCreated, tasksUpdated, tasksDeleted, appointmentsCreated, appointmentsUpdated, appointmentsDeleted, textMessagesCreated, textMessagesUpdated, textMessagesDeleted, callsCreated, callsUpdated, callsDeleted, dealsCreated, dealsUpdated, dealsDeleted, emailsCreated, emailsUpdated, emailsDeleted, eventsCreated, stageCreated, stageUpdated, or stageDeleted
