/**
  * @return Payment_Model_DbTable_Items
  */
 public static function getInstance()
 {
     if (is_null(self::$_instance)) {
         self::$_instance = new self();
     }
     return self::$_instance;
 }
 public function getItem()
 {
     if (is_null($this->_item)) {
         $itemModel = Payment_Model_DbTable_Items::getInstance();
         $this->_item = $itemModel->findByCode($this->_code);
     }
     return $this->_item;
 }