#fcm #push notifications

broadcast FCM pushes

@POST https://fcm.googleapis.com/fcm/send

HEADERS:
Authorization key=AAAA... (Server key)
Content-Type application/json

BODY:
{
    "to": "/topics/topicName",
    "content_available": false,
    "mutable_content": true,
    "data": {
        "click_action": "FLUTTER_NOTIFICATION_CLICK",
        "date": "2020-03-19 14:58:18",
        "type": "awd"
        "image": "https://img.pravda.com/images/doc/5/6/5670571-radutskyy-485_485x299.jpg"
    },
    "notification": {
        "type": "awd",
        "body": "Description of some sort",
        "image": "https://img.pravda.com/images/doc/5/6/5670571-radutskyy-485_485x299.jpg",
        "sound": "default"
    }
}