Pre sale question - easysocial native app

I have several questions before buying the Native App -
1) Is it fully sync with Joomla site - I mean - if a user will register on my application he will be registered to my site?
2) How will you process bug issues? let's say, If there is a bug in the core and you release a fix, how that process will be handled?
3) I assume it would be ok if I will decide to customize the app and add my own features to the App, is it ok?

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