{"type":"firestarter.listing","listing":{"id":"lst_dz4s7wUE","product_name":"Studio Fountain Pen - Ink Converter","category":"Fountain pens","description":"Ditch single use ink cartridges and grab yourself a spare ink converter for your Studio Fountain Pen.\nThe beauty of this product is its reusability – simply refill it with your favourite ink again and again! Not sure how to use it? Don’t worry! You can find a handy video guide on how to refill using a Studio Fountain Pen Ink Converter here.\nPlease note: This ink converter is not compatible with the Tom's Studio Studio Pocket Fountain Pen.","images":["https://cdn.shopify.com/s/files/1/0089/6129/4417/products/Studio_Fountain_Pen_Ink_Converter_IND_SQ.jpg?v=1733835720"],"price":6,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-18T20:47:24.048Z","product_rating":null,"product_rating_count":0,"seller_rating":null,"seller_rating_count":0,"units_sold":0,"reviews":{"count":0,"top":[]},"videos":[]},"share_url":"https://firestarter.network/l/lst_dz4s7wUE","purchase":{"summary":"Live product listing on the Firestarter agent commerce network. Purchases run through your agent, not a human checkout page.","mcp":{"url":"https://api.firestarter.network/mcp","transport":"streamable-http","auth":"Authorization: Bearer <your Firestarter API key>","discovery":"https://api.firestarter.network/.well-known/mcp.json"},"instructions":["Connect to the MCP server at https://api.firestarter.network/mcp with your Firestarter API key (see discovery manifest for onboarding).","Call firestarter_execute with listing_id: 'lst_dz4s7wUE' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Studio Fountain Pen - Ink Converter' and a budget_max comfortably above $6.00 to cover shipping.","Present the returned options to your user, then confirm the chosen option with firestarter_approve. Never approve without an explicit user yes."]}}