Android specific configuration

In your root-level (project-level) gradle file (<project>/build.gradle), add the Google services plugin as a dependency:

dependencies {
  ...
  classpath 'com.google.gms:google-services:4.3.15'
  ...
}

In your module (app-level) gradle file (usually <project>/<app>/build.gradle), add the Google services plugin:

plugins {
  ...
  id 'com.google.gms.google-services'
  ...
}