This question, How we can get Pre-Register / Unregister button on Play Store? is currently developer-centric. I could think to make it on-topic by asking what instead of how, though it might invalidate existing answer. Should we salvage it?

Umm.. okay, the answer has gone, but editing it can be seen as changing intent. Should I proceed, or just post it as a new question...

@AndrewT. A new question