eturns, or submits an assignment,
		when a HIT becomes "reviewable", or when a HIT expires, for any HIT of a given HIT type. To set up
		notifications for a HIT type, you call the <code class="function">SetHITTypeNotification</code> operation with
		a HIT type ID and a <a class="link" href="ApiReference_NotificationDataStructureArticle.html" title="Notification">notification
			specification</a>. </p><p> Amazon Mechanical Turk can send a notification using one of several "transports". The simplest transport