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No, it’s just assistant. You can do setup without it.
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Just ignore it. It’s used for Simulator builds afaik.
Regarding build.gradle. You have to have the following lines:
classpath ‘com.google.gms:google-services:3.0.1’
in your top-level build.gradle file and
apply plugin: 'com.google.gms.google-services'
in the app build.gradle file
I attached zip with my gradle files from sample project with working notifications v2 plugin