var postData = {};
    postData["school_name"] = $("#school_name").val();
    postData["borrower_address_zip_code"] = $("#borrower_address_zip_code").val();
    postData["student_enrollment"] = $("#student_enrollment").val();
      $.ajax({
        type : 'POST',
        data : JSON.stringify(postData),
        contentType : 'application/json',
        url : '${flowExecutionUrl}&_eventId=handel1&ajaxSource=true',
        cache : false,
        success : function(data) {
        alert('done');
        },
        error : function(jqXHR, textStatus, errorThrown) {
           alert('textStatus'+textStatus + 'errorThrown'+errorThrown);
         }
    });

<transition on="handel1">
      <!-- requestParameters -->
          <evaluate expression="studentLoan.createProperty(*********)"
              result="flowScope.content123" />
      </transition>