calcom.onCalendarEntryRejected subscribes when Cal.com rejects a connected-calendar entry.
automations/on-calendar-entry-rejected.automation.ts
Event
Additional provider fields are preserved.
Automate.ax creates and maintains the Cal.com webhook, verifies
x-cal-signature-256, and deduplicates provider retries. Use calcom.onEvent when one automation should receive every supported Cal.com event.