- 
composer require ctf0/firebase-broadcast-driver
- 
the package internally use kreait/firebase-phpto send data to firebase.
// config/broadcasting
return [
    'connections' => [
        // ...
        'firebase' => [
            'driver'          => 'firebase',
            'type'            => 'firestore', // database or firestore
            'databaseURL'     => env('FB_DB_URL'), // the real time database url
            'creds_file'      => env('FB_CREDENTIALS_FILE'), // service account json file
            'collection_name' => env('FB_COLLECTION_NAME'), // ex.notifications
        ],
    ],
];- 
add BROADCAST_DRIVER=firebaseto.env
- 
atm there no support for laravel-echo "any help is appreciated" but no worries, you still get the same payload as other broadcast drivers. however you can check the firebase api docs or vuefire if you are using vue, on how to listen for changes and update your app users accordingly.
{
    "notifications" : {
        "-LkgtAVVw0Ztwyjayd9n" : {
            "channel" : "private-App.User.091b0f7e-805b-4aab-8c99-445039157783",
            "data" : {
                "body" : "some body",
                "id" : "d54c44a2-8a42-43a4-bae0-e2b159d1533b",
                "title" : "some title",
                "type" : "App\\Notifications\\AlertUser"
            },
            "event" : "Illuminate\\Notifications\\Events\\BroadcastNotificationCreated",
            "timestamp": 1564183089538
        }
    }
}If you discover any security-related issues, please email ctf0-dev@protonmail.com.