Android specific configuration

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

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

• In your module (app-level) gradle file (usually project_name/app_name/build.gradle), add the Google services plugin:

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

OR

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apply plugin: 'com.google.gms.google-services'