The Amazon Appstore is now preloaded on BlackBerry 10.3 devices starting with BlackBerry Passport. This means that those people that are lucky (?) enough to be Blackberry Phone customers can access all of the apps in the Amazon Appstore.
For developers who are interested in publishing their app on BlackBerry devices via the Amazon Appstore and are an existing Amazon Appstore developer, all that is needed is to do is to have previously chosen to distribute the app or game on “Non-Amazon Devices.”
For existing BlackBerry developers who are new to the Amazon Appstore, you must register for a Amazon developer account and submit the app.