I built an app for iOS and Android in Cordova. I used the following Cordova plugin to support some of the Game Center and Google Play Games features:
https://github.com/cranberrygame/cordova-plugin-game
However, this plugin doesn't support Turn-Based Multiplayer and I can't seem to find any Phonegap/Cordova plugin that does. My main goal is that people would be able to issue a challenge to their friend, even if they haven't downloaded the app. I suppose I could use their social game ID and build something internally, but it seemed better to leverage what Google and Apple already offer.
Does anyone know of a plugin or any other way to implement this?
Have you checked out Cocoon by Ludei? Their plugins support turn-based multiplayer games and are freely available on github. http://cocoon.io https://github.com/ludei