Shopify uses variant_id for products, that is a unique identifier for each version of a product (for example distinctive measurements or colors). You could find the variant ID by checking your Shopify product details or using a Shopify application that exports product knowledge. NOTE: This aspect is just for making https://zanderkmmkn.loginblogin.com/39678034/automatic-google-merchant-center-google-shopping-things-to-know-before-you-buy