Send a push notification to app users. Uses the same Cloud Function path as the in-app admin (FCM). Leave "Limit to user IDs" empty to broadcast to everyone with push enabled.
Broadcast playbook
- Set a deep link so taps land in the right screen (better CTR).
- Send a test first using Limit to user IDs (1 to 5 internal UIDs).
- Reserve full-database sends for high-signal moments (major release, critical fix, big con push).
Console-side campaigns and audiences: docs/features/ENGAGEMENT_CAMPAIGNS_PLAYBOOK.md