GOOGLE_MAPS_API_KEY=AIzaSyB-g7AdE_hmuDjv7GMMPbrfT0N36yR3N7o
# Optional if not using RTDB from backend.
FIREBASE_DB_URL=

FCM_PROJECT_ID=
FCM_CREDENTIALS_JSON=
# FCM_CREDENTIALS_PATH=/path/to/service-account.json

# Optional: rate limits for FCM (per recipient/topic)
# FCM_LIMIT_PER_HOUR=100
# FCM_LIMIT_PER_DAY=500