A MED (Pix refund claim) was opened against a deposit. Deliveries are not ordered. Sent as POST to the URL registered for this partner, with Authorization: Basic <secret> carrying the registered secret verbatim. Registration is done through the Telegram bot, not through this API. Respond within 15 seconds. A failed delivery is NOT retried: reconcile with GET /deposits instead of waiting for a second attempt, and still deduplicate on qrId.