Shopify utilizes variant_id for products, that is a unique identifier for each Variation of a product (which include diverse sizes or colors). You'll find the variant ID by checking your Shopify product particulars or using a Shopify app that exports product info. Then to create a feed, you have lots https://andyluadh.tblogz.com/new-step-by-step-map-for-google-merchant-center-products-46324504