Android Push Notification Basic Project

i need a basic android application, it will support Push Notifications using firebase. Notifications support multiple devices. Example: if one user change ticket status other user get the status of ticket change. simple project using two applications one sender app and receiver app with source code. In Java only. 1. First you have to get the fire base token from android app. 2. send the fire base token while user login your app and save the token against the user. 3. Whenever the user request for service you can get the token of the particular user and send a message to fire base api with that token from server side. It will automatically send the message to that particular device whoever login your app. 4. Make sure you update the token while if other user login your app in same device