/**
  * sample_AddDisputeResponse::dispatchCall()
  * 
  * Dispatch the call
  *
  * @param array $params array of parameters for the eBay API call
  * 
  * @return boolean success
  */
 public function dispatchCall($params)
 {
     $req = new AddDisputeResponseRequestType();
     $req->setDisputeActivity($params['DisputeActivity']);
     $req->setDisputeID($params['DisputeID']);
     $req->setMessageText($params['MessageText']);
     $res = $this->proxy->AddDisputeResponse($req);
     if ($this->testValid($res)) {
         $this->dumpObject($res);
         return true;
     } else {
         return false;
     }
 }