Add webhook registrations to event mailing list fast

Unhandled registration webhooks leave lists incomplete and invitations unsent. This ensures each registrant is added to the right mailing list so campaign leads can begin outreach within minutes.

Overview

Incoming registrations delivered by webhook can sit unprocessed and cause missed invites and outreach delays. This flow captures each registration, tags it, and places it on the correct list so campaign leads can begin segmented outreach within minutes.