How to prepare an APK for the Amazon Android App Store

Question

 From what I can tell, you submit an unsigned binary and they wrap it in their own code and produce a signed apk?

i have these questions-

1. Does the Amazon App Store perform a zipalign ?
2. If you have your app in the Android Market (Google's) already, is it recommended to use the same package name 
3. I also saw elsewhere, that they offer the option to download the apk they prepare and sign it with your own key. Is it recommended to take this and then sign it with the same key you are using in the Android Market? 

Are there any other considerations we should know here?

Answer 1

you should use zipalign during every build, as a matter of practice.

Use the same exact build process for Amazon as u do before publishing to Google.

only difference is an Interface's variable to determine the market link at build time, if/else is compiled out