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

Headers:
Content-Type: application/json
Authorization: key=AAAALc68Sz8:APA...

Body:
{
	"to": "dH34nQFfLats1Nt4z9rHLT:APA91bEt...",
	"data": {
		"notification": {
			"title": "Hello title",
			"body": "Boomm!!!!",
			"icon": "https://i.imgur.com/lol.png",
			"link": "https://gist.github.com/zmts"
		}
	}
}
```