EventFilter 
    class EventFilter
Specifies the settings for an event that causes a campaign to be sent or a journey activity to be performed.
Types
Properties
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                  The dimensions for the event filter to use for the campaign or the journey activity.
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                  The type of event that causes the campaign to be sent or the journey activity to be performed. Valid values are: SYSTEM, sends the campaign or performs the activity when a system event occurs; and, ENDPOINT, sends the campaign or performs the activity when an endpoint event (Events resource) occurs.