Passing Parameters into your App

One of the great things about doing any Web App is just the ability to throw some additional variables/data at it inline via URL (see anything after the likely ? you see in the URL that got you here).  These inline variables are handy ways to do basic integration for data that you don't really care about securing.  PowerApps makes it as simple as any other web app to send data in.  It is accessing/using that data to make decisions before you do anything else that can be annoying.

I have recently (June 2019) completely re-written this post as Microsoft has fixed some of the initial and most annoying aspects of this process.