protected function getProductIdsFromBasket( \Aimeos\MShop\Order\Item\Base\Iface $basket )
	{
		$list = [];

		foreach( $basket->getProducts() as $orderProduct )
		{
			$list[ $orderProduct->getProductId() ] = true;

			foreach( $orderProduct->getProducts() as $subProduct ) {
				$list[ $subProduct->getProductId() ] = true;
			}
		}

		return array_keys( $list );
	}