# Environment Variables

Copy `.env.example` to `.env`. Required variables:

| Variable | Purpose |
|---|---|
| `DATABASE_URL` | PostgreSQL connection string |
| `GOOGLE_PROJECT_ID`, `GOOGLE_CLIENT_EMAIL`, `GOOGLE_PRIVATE_KEY` | Firebase Admin SDK (FCM) |
| `NEXT_PUBLIC_VAPID_PUBLIC_KEY`, `VAPID_PRIVATE_KEY` | Web Push |
| `WS_APIKEY` | WebSocket/file storage API key |
| `WIBU_REALTIME_KEY` | Real-time communication |
| `FCM_KEY` | Firebase Cloud Messaging |