action reverb_post_listings_listing_id_conversations { label: "Start a conversation with a seller" description: "Start a conversation with a seller" provider: reverb method: POST path: "/listings/{listing_id}/conversations" encoding: json input: { type: "object" properties: { listing_id: { type: "string" } } required: ["listing_id"] additionalProperties: false } output: { type: "object" additionalProperties: true } }