Missing api_key/current key with Google Services 3.0.0

Question

Since I upgraded the project with the latest version of google services and libraries (9.0.0), I have this strange issue :

Grade console :

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Answer 1

If you are using firebaes, you have to copy serverKey from the firebase to the google-services.json

 "api_key": [{ "current_key": "SERVER_KEY"}

To get the server Key, Goto ProjectOverview> Project Settings > CloudMessaging > Copy OR generate and copy serverKey..