public function getResponseParam($param) {
    if (isset($this->notifyParams[$param])) {
      return $this->notifyParams[$param];
    }
    return NULL;
  }
public function getResponseParam($param) {
    if (isset($this->notifyParams[$param])) {
      return $this->notifyParams[$param];
    }
    return NULL;
  }
public function getResponseParam ( $ param ) { if ( isset ( $ this -> notifyParams [ $ param ] ) ) { return $ this -> notifyParams [ $ param ] ; } return NULL ; }
returns the data from the given parameter

@param String $param response parameter key
@return String data of the given response key
returns the data from the given parameter