Unable to get access token

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.

The place to do something with the token is in the callback you've added in the instance passport.use(new FitbitStrategy({..config..}, function() { /* HERE YOU HAVE THE TOKEN */}). In the /auth/fitbit/callback you only need to point to fail/success urls, no need for a callback there.

Can you provide sample code? I used the code as you had it in the example but I guess it's not complete?

This is the place where I'm failing to get the access token:

app.get('/auth/fitbit',
passport.authenticate('fitbit', { scope: ['activity','heartrate','location','profile'] }
));