OnBuy is a UK marketplace. Brands that already sell on Amazon and eBay in Britain often add it as another listing of the same SKU.
Orders, the OnBuy listing, price, and quantity.
They come into the UK line of the product record.
Price and quantity can go back inside the band.
Whether OnBuy is live, who holds the seller login, and whether the UK price is shared with Amazon or set on its own.
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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