The Unity game already registers a Firebase Installation ID and reacts to a fixed payload. This Next.js project (admin dashboard and customer support agent) needs two player routes, a send when an agent replies, and the admin broadcast actions.

Leave the existing support-agent app notifications as they are. Those still use that app's own registration tokens.

The game talks to https://kkadmin.playpoolstudios.com with the bearer token from POST /api/support/player/login. Use that same player auth on the new routes. A 401 signs the player out of support, so only return it when the bearer token is actually invalid.

Store the game install

Add one row per player. A new registration replaces the previous one.

Column	Value
`userId`	Support player id from the bearer token
`fid`	Firebase Installation ID from the game
`platform`	`android`
`updatedAt`	Set on every successful register

This id is not the registration token already stored for the support-agent app. Keep those tables separate. The game id only works for the Android app com.WalkInvest.KickKings in the kickkings-admin Firebase project. The same service account can send to both apps.

`POST /api/support/player/devices`

{ "fid": "the-installation-id", "platform": "android" }

Upsert that player's row. Any 2xx is enough. {} is fine. The game treats an empty success body as success.

`DELETE /api/support/player/devices`

{ "fid": "the-installation-id", "platform": "android" }

Delete the row only when both userId and fid match. If it is already gone, still return 2xx. The game logs out even when this call fails.

When an agent replies

After the staff message is saved, load that ticket's player and send to the stored fid. Do this only for a staff reply. A player message does not notify the player.

{
  "message": {
    "fid": "<stored fid>",
    "notification": {
      "title": "Support",
      "body": "Support replied to your ticket"
    },
    "data": {
      "type": "support_reply",
      "ticketId": "<ticket id>"
    },
    "android": {
      "priority": "high",
      "notification": { "channel_id": "support" }
    }
  }
}

data.type and data.ticketId must be those exact strings. ticketId is the same id the game already uses in /api/support/player/tickets/{ticketId}. Both data values have to be strings.

Keep the lock-screen body generic. Ticket text can include withdrawal or payment details, so do not put the message body in the notification.

With the Firebase Admin SDK, set fid to the stored id. On an older SDK that has no fid field, put that same id in token. During the current migration, token still accepts an installation id.

If FCM returns UNREGISTERED, delete that row and stop retrying it.

The game opens that ticket when it receives support_reply. If the player is already looking at it, the thread refreshes immediately.

Admin notifications

Add two actions to the admin dashboard. Both use the same sender and the same Android channel.

Everyone

This includes players who never opened support.

{
  "message": {
    "topic": "kk_broadcast",
    "notification": { "title": "<title>", "body": "<message>" },
    "data": { "type": "announcement" },
    "android": {
      "priority": "high",
      "notification": { "channel_id": "support" }
    }
  }
}

Do not prefix the topic with /topics/. The game subscribes to kk_broadcast on its own.

One player

Use the same payload, with fid set to that player's stored id and no topic. If that player has no row, show that the game has not registered yet.

announcement does not open a screen. The title and body are the whole message, and they have to be in notification. The tray shows that text while the game is in the background. While the game is open, this build does not add its own banner.

Sending a support reply and an admin message is the same function. Only fid versus topic, and support_reply versus announcement, change.