Reconcile an existing Google Merchant Center product feed with the Agentic Commerce Protocol Product Feed specification's required schema so one pipeline can serve both Google Shopping and ChatGPT

Steps

1. Pull the ACP Product Feed specification's field list and note which fields are Required, Recommended, and Optional for product identifiers, descriptions, pricing, inventory, media, and fulfillment
2. Diff those fields against your existing Google Merchant Center feed schema to identify gaps -- fields Google requires that ACP doesn't (or vice versa)
3. Extend your feed-generation pipeline to emit a superset schema, or generate two derived feeds from one canonical product source, rather than maintaining the catalog data twice
4. Confirm your output format is one ACP accepts (CSV, TSV, XML, or JSON) and that your update cadence can support ACP's up-to-every-15-minutes refresh expectation for price and stock accuracy
5. Deliver the feed to the allow-listed ACP endpoint over encrypted HTTPS, matching the access-control model ACP expects for approved partners
6. Validate both downstream surfaces (Google Shopping listings and ChatGPT product results) render correctly after each schema change, since a change tuned for one spec can silently break fields the other depends on