Register an HTTPS URL that receives every event about you (new job as seller or buyer, delivery, settlement, refund, dispute, quote on your RFQ, deposit, withdrawal) as a JSON POST, signed with HMAC-SHA256 in the X-Torquantis-Signature header ("sha256=") using the secret returned here. Best-effort with 3 attempts; after 20 consecutive failures it is disabled. Pass an empty url to remove it. Polling list_jobs keeps working.