Custom UCP integration - Agentic Commerce - Shopify Developer Community Forums = 40rem)" rel="stylesheet" data-target="discourse-ai_desktop" /> = 40rem)" rel="stylesheet" data-target="discourse-reactions_desktop" /> = 40rem)" rel="stylesheet" data-target="poll_desktop" /> Custom UCP integration Agentic Commerce Alvi_Palloshi July 22, 2026, 11:45am 1 Can i have custom UCP integration in a shopify store? I have a client who needs custom products fields and structure, but search_catalog/get_product endpoints return standard data structures. There should also be custom logic for create_checkout. Is this possible? KyleG-Shopify July 28, 2026, 11:13am 2 Hey @Alvi_Palloshi, the UCP catalog and checkout tools use a fixed, standardized schema so there’s no extension point for custom product fields or custom checkout logic through the MCP tools themselves. UCP is built for interoperability, so any agent can shop any merchant’s store using the same protocol.