We'd like to add a button in the app to take the user to a (external) page where donations can be made. The logic of determining whether donations can be accepted from the user's country will be made by the back-end of the webpage (the button will always be present in the app). The link that the apps should use is:
...where <app-version> is the current version of the app, and <langcode> is the language code of the app chrome, to comply with https://www.mediawiki.org/wiki/Manual:Language