For Shopify, Google, Meta, ChatGPT Ads, Amazon, TikTok, the schema library lists the product details that platform expects, which are required versus recommended, and how they must be formatted. It is a reference: Google and Meta are live output channels today, ChatGPT Ads produces a validated feed file you connect yourself, and Amazon and TikTok are documented here ahead of their output shipping. It is also where the differences become obvious — ChatGPT Ads uses OpenAI's own commerce vocabulary (item_id, image_url, price as "79.99 USD") rather than Google's field names, and its product category is a free-form path rather than the Google taxonomy. When you are unsure why a platform wants something a certain way, this is where you look it up.
See Platform schema library in use
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