title: How to know if an app has been downloaded from Google Play or Amazon?
body: <p>Is there any way to know if an application has been downloaded from Amazon App Store or Google Play Store? I meant within the app itself, of course.</p>
  
  <p>I have deployed an app to both sites and I rather like to know from where the customer has downloaded it within the application. I know, I can deploy different applications to each service, but this adds some maintenance work that could be avoided if there were some manner to solve it just with a conditional within the app using the same package.</p>