Obtain short lived access token from dropbox without redirect url(through .net code or javascript)

Question

I am trying to implement a way to obtain a short lived access token from dropbox, then upload multiple file to a folder. and finally revoke the token. This can obtain access token can be .net code or in javascript. But what I am seeing from the dropbox documentation is having a redirect url which I don't want to redirect anything.

also I do not need to ask the end user to allow anything, what I need is to get a temp access token and upload some files.

This scenario is doable in Amazon S3 by generating a short lived policy for file upload.

Thanks for any help.