</td><th align="left">Note</th></tr><tr><td align="left" valign="top"><p> Notification messages are only sent once. Notifications are not sent again, even if the HTTP
			request returns with an error code or fails for any reason. Your application will need to tolerate
			missing some notification messages. </p></td></tr></table></div><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Note"><tr><td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]"