Flutter, ZIP - All files for buyers

I want to create mobile applications using Flutter and sell these applications here. I would like to know what needs to be loaded on the site? I mean Main Files (ZIP - All files for buyers). What should be in this ZIP file?

I’m using AndroidStudio. I will put only my AndroidStudio project in ZIP? If I make some kind of backend, I will also put it in a ZIP.

And if there are no backends - then only AndroidStudio project and nothing else?

Thanks! Great links!