Need to learn all about DLC. Need basic advice.

So I need to make a paid expansion to my game and I've never done this before. Asset Bundles seem to be the way to go, and on Steam it seems fairly straightforward, but I really need to figure out how to do this on Android. I saw some announcement that the Google Play store was going to start supporting DLC, but I can't find that info anywhere now.

How is DLC usually handled on the Google Play Store? Does anyone have experience with that? I suppose I could just include any expansions in the main build and use IAP to turn them on, but that seems very hackable and insecure.