iPad and Box.net (oauth2)

What are you trying to do?  If trying to load a file from your app to Box, it might be simpler to use the below.  It uses iOS 'Open In' functionality to open a list of apps based on the file type you want to share.  If Box is installed (or dropbox or Gdrive), they should show up as options.  The below is a basic one that pops the dialog on ipad in top right corner but you can customize it to display in other locations.

https://github.com/katopz/ane-device-file-util