As a Hungarian software developer, up to this day it is not possible to sell apps on Google Play, because Hungary is not on the merchant list, therefore only free apps are allowed to upload from Hungary.
Is it possible and legal to upload the free trial version of my app to Google Play, and when the trial expires, through an intentional and unequivocal notification / window redirect the user to my own website, where she / he, after the payment process, can get the full version?
I'm also planning to put the link of the full version app to the Google Play app description section.