{"negotiate_protocol": "negotiate.v1", "store": {"name": "FYF", "city": "\u2014", "rep_name": "FYF", "tagline": "FYF \u2014 premium quality, fair prices.", "policy": "Free shipping on most orders. 30-day return window."}, "merchant_skill": {"name": "pier39-merchant", "repo": "https://github.com/sanjana-pier39/pier39-skills", "description": "Claude agent with the pier39-merchant skill loaded as system prompt."}, "endpoints": {"start_chat": {"method": "GET", "url_template": "https://checkout-agent.pier39.ai/fyf/api/store/chat/start?product_id={product_id}", "params": {"product_id": "string, required, must be one of products[].id"}}, "send_message": {"method": "GET", "url_template": "https://checkout-agent.pier39.ai/fyf/api/store/chat/{session_id}/say?message={url_encoded_message}"}, "read_history": {"method": "GET", "url_template": "https://checkout-agent.pier39.ai/fyf/api/store/chat/{session_id}"}, "catalog": {"method": "GET", "url": "https://checkout-agent.pier39.ai/fyf/api/store/catalog"}}, "products": [{"id": "fyf", "name": "FYF\u2122", "subtitle": "footwear", "list_price": 80, "currency": "USD", "kind": "footwear", "page_url": "https://checkout-agent.pier39.ai/fyf/store/p/fyf", "start_chat_url": "https://checkout-agent.pier39.ai/fyf/api/store/chat/start?product_id=fyf"}], "limits": {"currency": "USD"}}