Creates an action url from a different portlet
<%@ taglib uri="http://liferay.com/tld/portlet" prefix="liferay-portlet"%>
<liferay-portlet:actionURL portletName="aragmultioptionsalesonlineportlet_WAR_aragmultioptionsalesonlineportlet" var="actionUrl">
<liferay-portlet:param name="action" value="start_payment" />
</liferay-portlet:actionURL>