Google Merchant Center is the catalog Google Shopping and free listings read. It is a feed of price, availability, and the product page, and it goes stale when the site changes and the feed does not.
The feed: id, title, price, availability, and the link to the product page.
That feed comes into the record so a price on the site and a price in Google can be seen together.
An updated price and availability can go back into the feed when they match the record and sit inside the band.
Who builds the feed today, how often it is pushed, and which SKUs are in Google that are missing on a marketplace.
An API is the door the system opens for orders, stock, and listings. An MCP server is a tool surface the AI can call, with the same guardrails. The call names who holds the login, which objects are read, and which writes wait for a person.
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