Store Sync is the component of PayPal Agentic Commerce that makes a merchant's catalog discoverable to AI assistants.
It syncs the merchant's product feed to PayPal in the format AI surfaces expect, so that products can be surfaced with accurate price and availability when a shopper asks an assistant to find them.
Store Sync handles discoverability; it is the prerequisite for in-assistant checkout (see Agent Ready). Feed delivery and updates are typically managed by the merchant's eCommerce/feed provider.