Windows & Android

(1) Go to the Firebase Console for your project and then navigate to the Project Settings page. 

(2) Then scroll down and create an Android Application.

(3) Download the google-services.json file.

(4) Locate the google-services.json file that was downloaded and place it inside your Unreal Project’s root directory.

Mac and iOS

(1) Go to the Firebase Console for your project and then navigate to the Project Settings page. 

(2) Then scroll down and create an iOS Application.

(3) Download the GoogleService-info.plist file.

(4) Locate the GoogleService-info.plist file that was downloaded and place it inside your Unreal Project’s root directory.