Query Shopify's Catalog MCP for cross-merchant product search so your agent can find and compare products across all eligible Shopify stores

Steps

1. Create a free account in the Shopify Dev Dashboard and navigate to the Catalog section to obtain your OAuth client credentials (client ID and client secret).
2. Exchange client credentials for a short-lived JWT access token via a POST to Shopify's token endpoint; tokens have a 60-minute TTL and must be refreshed before expiry.
3. Connect your MCP client to the Catalog MCP server endpoint and authenticate with Authorization: Bearer {token}; the server exposes two primary tools: search_global_products and get_global_product_details.
4. Call search_global_products with query text and optional filters (price range, shipping destination, product options) to retrieve ranked products across all eligible Shopify merchants in a single cross-merchant call.
5. For a selected product, call get_global_product_details with the Universal Product ID to retrieve the full option matrix (sizes, colors, variants) and availability across all merchants selling that SKU.