For the past week or so I've been extremely, extremely stuck on getting Google Play leaderboards operational in my game. What I'm really having trouble with is signing into Google Play. The only way I've seen it done in Monogame is with a very old version of Google Play Services, using classes that don't even exist in the current version. All I've come across so far is some Xamarin example code, which seems to run fine. However, that code makes use of a SignInButton, which, for whatever reason, I have not been able to run the code without. This SignInButton class, to my knowledge, can only be used in a Xamarin form/view/whatever (using an xml layout file), which I'm finding extremely difficult to integrate into my game, which, of course, doesn't use this.
If anyone has any experience with getting Google Play Games working in recent versions of the GPS package, I'd love to hear how you went about it.