Facebook Settings Class Name

Hello Guys,
I am developing this game for android.
I followed the tutorial at Facebook.com(Developers) for Android.
I am wondering what this “class name” parameter is used for.

And the class name comes under “com.facebook.unity” , is it possible to change it somehow that comes under my package name?

Or it is not necessary and is the default/common for all apps that have this facebook package in them?

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Just Set class name to Facebook developer->Your App → Settings-> Basic-> Android