how to work with realtime?

hello everyone, I opened the realtime documentation, but I didn't understand how to work with it. It seems to show how to create an object, but how to use it and get, say, there is no value from the database

TL;DR

Learn to work with real-time updates by creating a document accessible to users. Set up a subscription that triggers an event when the document changes. Use Realtime's subscribe function in client code, like the Kotlin example provided, to listen for updates from the database and perform actions, such as logging the new data.

It seems to show how to create an object

what do you mean?

TypeScript

    suspend fun getRealtime(onUpdate: (Notification) -> Unit) {
        val realtime = Realtime(client)

        val subscription = realtime.subscribe("databases.$databaseId.collections.Notification.documents") { event ->
            val payload = event.payload
            Log.d("REALTIME_DATA", "new message: ${payload}")
        } 
    }