I want to integrate Dropbox to my web app. The idea is that, having a user's mail and password I can access his files and allow him to work with them, all this using APIs. Is this possible, can anyone point me out to an example or explain how can I achieve this, I'm new to Dropbox APIs so if this is to simple to answer please do it anyway. I'm using php.
As said in APAD1's comment this can't be done with out the express user authorization. the oauth will redirect the user to a page and there he will aprove your request to use his data through APIs.