How to set the app or version?

[mingzaily]

This is my code.

What should I do? Thank you.

[jeromegamez]

Unfortunately, there's no way built-into the FCM REST API (which this and the other SDKs use) to target a specific app or app version. (See this StackOverflow answer by one of Firebase's own engineers, Frank van Puffelen). If you want to target an App and/or Version, I think you need to send your messages via the Firebase Console…