GTIN https://support.google.com/merchants/answer/160161?hl=en Anforderungen an eindeutige Produktkennzeichnungen kravene om unike produktkoder https://support.google.com/merchants/answer/160161?hl=en benzersiz ürün tanımlayıcısı gereksinimlerini product branding Google requisitos de identificadores únicos de producto requisitos de identificadores únicos de producto benzersiz ürün tanımlayıcısı gereksinimlerini Google unique product identifiers unique product identifier (UPI) https://support.google.com/merchants/answer/160161?hl=en https://support.google.com/merchants/answer/160161?hl=en https://support.google.com/merchants/answer/160161?hl=en unique product identfiers requisitos de identificador exclusivo de produto https://support.google.com/merchants/answer/160161?hl=en https://support.google.com/merchants/answer/160161?hl=en Google Shopping data feed update will require