protected function saveTransationRef( \Aimeos\MShop\Order\Item\Base\Iface $baseItem, $ref )
	{
		$type = \Aimeos\MShop\Order\Item\Base\Service\Base::TYPE_PAYMENT;
		$serviceItem = $this->getBasketService( $baseItem, $type, $this->getServiceItem()->getCode() );

		$attr = array( 'TRANSACTIONID' => $ref );
		$this->setAttributes( $serviceItem, $attr, 'payment/omnipay' );
		$this->saveOrderBase( $baseItem );
	}