title: Can I use FCM firebase without their firebase DB?
body: <p>I have <code>Laravel</code> project and I need to seed notifications from web to mobile (android,iOS)  via API, a lot of recommendations goes to Firebase FCM (Firebase Cloud Messaging), but I have a question: can I use FCM of Firebase without using the DB of Firebase just unsing my own DB which is  <code>MYSQL</code> ?</p>