calcom.onRoutingFormFallbackHit subscribes when a routing form uses its fallback route.
automations/on-routing-form-fallback-hit.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.