[null,null,["最后更新时间 (UTC):2023-12-01。"],[[["Product identifiers, such as GTINs, MPNs, and Brand, are crucial for merchants to distinguish their products and improve search visibility on Google Shopping."],["Providing accurate product identifiers helps validate products against Google's catalog, enhancing product data and potentially increasing clicks and impressions."],["While GTINs are highly recommended and sometimes required, if a product lacks valid identifiers, leave the identifier attributes blank, prompting the merchant to update them through error notifications."],["Avoid using the `identifier_exist` field as it doesn't encourage merchants to provide the necessary identifiers for optimal product listing."]]],[]]