How do you make Flavours?

How You Can Build Flavors

In Xcode, configure the app version and build: In Xcode, open Runner.

The first step is to download google-services. json file(s) from each Firebase project to a temporary location at your machine. Next, create two folders android/app/src/dev and android/app/src/prod for each flavor. The Firebase configuration files go under their flavor folders under android/app/src/ folder..