How do I make sure google play services SDK is integrated in unity project(Android)

I am trying to add applovin to my game. One of the requirements in the unity3d integration is that it needs the Google Play Services SDK integrated in the app.

There is a variety of SDK's on googles site when I click on the link provided by applovin, and I chose one. Apps show up on mobile devices, and it even gives me the number of impressions for the app on the applovin site.

I guess I'm wondering if I have done everything correctly. If anyone has experience integrating applovin into a unity project for android mobile devices, how do I make make sure that everything is working properly?

Mainly, I want to know if I've installed the correct google play services SDK so that
applovin works and doesn't just appear to work.

Thanks in advance!