I has project with 2 build types. Every build type has specific applicationIdSuffix.
BuildType : dev , applicationIdSuffix = .dev
BuildType : prod , applicationIdSuffix = .prod
In Firebase console I create application for build type = dev.
As result I download file google-services.json. I put it in c:\myproject\android\app\
In this file "package_name": "com.myproject.dev"
OK. It's work.
Now I in Firebase for the same project, I need to create another application with another buildType = prod.
As result I download NEW file: google-services.json.
In this file "package_name": "com.myproject.prod"
Where I need to put this second file google-services.json?