rvices with their credentials. It also contains APIs that allow
    you to resolve any issues at  runtime, such as a missing, disabled, or out-of-date
    Google Play services APK. The client library has a light footprint if you use
    <a href="/tools/help/proguard.html">ProGuard</a> as part of your build process, so it won't have
    an adverse impact on your app's file size.  
</p>
<p>
    If you want to access added features or products, you can upgrade to a new version of the
    client library as they