Problem with fitbit-passport-oauth2

[synedra]

I know the module isn't owned by Fitbit but I'm hoping someone can point me in the right direction.  I'm having trouble with 

Failed to obtain access token 

 I think the problem is likely that I don't have the right stuff in /auth/fitbit/callback

This is what I've got:

app.get('/auth/fitbit',
  passport.authenticate('fitbit', { scope: ['activity','heartrate','location','profile'] }
));
app.get('/auth/fitbit/callback', passport.authenticate('fitbit', { failureRedirect: '/?error=auth_failed' }),
	function(req, res) {
		// Successful authentication, redirect home.
		res.redirect('/phone');
	}
);

As I said, I suspect I need to do more with the /auth/fitbit/callback portion to actually exchange the code for a token.

Can anyone help?  I've got a conference to go to with this thing and it just stopped working (probably because of the oauth1.0a change.

Thanks,

Kirsten