1-) POSTMAN - Firebase Cloud Messaging FCM Tüm telefonlara bildirim göndermek için topic e eklenir

kaynak : https://stackoverflow.com/questions/38237559/how-do-you-send-a-firebase-notification-to-all-devices-via-curl

FirebaseMessaging.getInstance().subscribeToTopic("allDevices");

{

"notification":{

    "title":"note-Title",

    "body":"note-Body"

    },

"to":"/topics/allDevices"

}

POSTMAN ÖRNEK :

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

POST BODY RAW JSON :

{

"notification":{

    "title":"note-Title",

    "body":"note-Body"

    },

"to":"/topics/allDevices"

}