Where can a developer get the information who downloaded his app? E.g. if a customer requests support for an app, how can the developer check that the request comes from a legitimate customer and not from someone who stole his app? Currently it seems that developers need to force their "Amazon"-Customers to register their purchase with the developers servers. Is it intended this way? Thanks!
I guess if they bought your app they'd have received a receipt for your app via email. So if you wanted to verify that a support request was coming from someone who legitimately purchased your app then you could ask them to forward the receipt email to you.