{"message":"FCM Notification Bridge API","version":"1.0.0","endpoints":{"health":"GET /notifications/health","sendNotification":"POST /notifications/send (requires authentication)"},"authentication":{"type":"API Key","method":"Authorization: Bearer YOUR_API_KEY"},"documentation":{"sendNotification":{"method":"POST","url":"/notifications/send","headers":{"Content-Type":"application/json","Authorization":"Bearer YOUR_API_KEY"},"body":{"topic":"string (required)","title":"string (required)","body":"string (required)","url":"string (optional)","image":"string (optional)"}}}}