No `oauth_callback` parameter in Garmin oauthConfirm URI 
Using express and trying to get the garmin flow working.
The URI for the redirect doesn't seem to have any `oauth_callback` parameter in it 
`https://connect.garmin.com/oauthConfirm?oauth_token=<redacted>`

My config.json
```
{
  "defaults": {
    "origin": "https://example.local:3000",
    "transport": "session"
  },
  "twitter": {
    "key": "[CONSUMER_KEY]",
    "secret": "[CONSUMER_SECRET]",
    "callback": "/handle_twitter_callback"
  },
  "garmin":{
    "key": "[redacted]",
    "secret": "[redacted]",
    "callback": "/handle_garmin_callback"
  }
}
```