Login issue

[viaConBodhi]

Looks like you're maintaining the package more then other so here goes...having issues logging in and getting
400 Client Error: Bad Request for url: https://api.robinhood.com/oauth2/token/
at
res = self.session.post(login(), data=payload, timeout=15)
res.raise_for_status()

I'm assuming it has something to do with the payload but I'm not an oauth2 expert. Do you know how to fix?
Thanks,