Add endpoints in Settings → API and MCP, or with POST /v1/webhooks. Events: article.published, article.updated, article.unpublished, article.deleted, edit.proposed, draft.created, changelog_entry.published, task.completed, conversation.escalated, lead.created. Each delivery is a JSON POST with usedocs-event, usedocs-delivery, and usedocs-signature: t=<unix seconds>,v1=<hex>, where v1 is the HMAC-SHA256 of <t>.<raw body> with the endpoint's signing secret.
Deliveries are logged with status and timing. A delivery that fails (no answer within 10 seconds, or a non 2xx status) is retried after 5 and 30 minutes, then 2, 8, and 24 hours, with the same usedocs-delivery id and a usedocs-attempt count, so dedupe on the delivery id. Handoff and lead alerts for chat tools have their own webhook integration.