JS OAuth 2.0 on Windows Phone 8.1

So, I'm trying to create a Gitter client for Windows Phone and to do so I need to use Bearer OAuth on their API. This process seems to result in a redirection to a gitter webpage (to get access tokens) and then it redirects to a web page specififed by my application. However obviously an APP is not a web page, so how am I supposed to get the returned temporary access token to use the API?

I've read a little bit about using http://ms-app<security identifier> but it's all very fuzzy and little to no information seems to be about using it without using c#, but that's not what I'm looking for.

Any help would be greatly appreciated!

EDIT I just noticed this has been asked here oAuth 2.0 in Windows Phone 8.1 but hasn't been awnsered. Sorry for the duplication.