从相同的代码创建免费/付费的应用程序版本

So I'm coming down to release-time for my application. We plan on releasing two versions, a free ad-based play-to-unlock version, and a paid fully unlocked version. I have the code set up that I can simply set a flag on startup to enable/disable ads and lock/unlock all the features. So literally only one line of code will execute differently between these versions.So I'm coming down to release-time for my appli