InAppMessageDisplayDelegate    
    interface InAppMessageDisplayDelegate
Message display delegate
Functions
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                  Called to check if the message is ready to be displayed. This method will be called for every message that is pending display whenever a display condition changes. Use notifyDisplayConditionsChanged to notify whenever a condition changes to reevaluate the pending In-App messages.
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                  Called when a message finished displaying
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                  Called when a message will be displayed.