Pinterest sells from a catalog feed. A pin that shows a price the site no longer charges is a drift the record can see.
The catalog feed: product id, price, availability, and the landing page.
The feed comes in so Pinterest price and site price sit on one row.
Price and availability can go back into the feed when they match the record.
Who publishes the Pinterest catalog, how often, and whether the feed is the Shopify catalog or a separate file.
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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