Passing Parameters from Workflow to OAF syntax:

JSP:/OA_HTML/OA.jsp?page=/agam/oracle/apps/xxcust/xxagam/request/webui/AGAMUserReqDetLinMgrRN
&p_NotificationID=-&#NID-
&p_UserID=-&SELECTED_PERSON_USER_ID-
&p_RequestSubGroupID=-&REQUEST_SUB_GROUP_ID-
&p_Action=-&ACTION_TYPE-
&p_RequestGroupID=-&REQUEST_GROUP_ID-

Whereas p_NotificationID  is OAF parameter 
and NID  is workflow attribute.

get these parameters in workflow using below syntax:

      String strNotificationID= pageContext.getParameter("p_NotificationID").toString();