Receive BaseLinker (Base.com) webhooks. Use when building a BaseLinker order or warehouse callback receiver, because BaseLinker is not a normal webhook source: deliveries arrive as HTTP HEAD requests with NO body, the entire payload is in the query string (observed params: order_id, state), there is NO signature verification of any kind (no HMAC, no secret, no handshake), and your response must be a bare bodyless 200. Use when debugging an empty req.body, wiring app.head / an exported HEAD route handler / @app.head, or polling getJournalList for change tracking.