get user profile details using access token

i am getting token and secret while authorizing user with garmin but profile is an empty object. i need profile details too.
so i am trying to fetch profile details with outh request method using the token i am receiving but i dont know the right url to hit to get profile info.
can someone please help. url used below is not working.
problem is similar to - github.com/.../73

let client = new OAuthStrategy({
    requestTokenURL: configAuth.garmin.requestTokenUrl,
    userAuthorizationURL: configAuth.garmin.userAuthorizationUrl,
    accessTokenURL: configAuth.garmin.accessTokenUrl,
    clientID: configAuth.garmin.clientID,
    clientSecret: configAuth.garmin.clientSecret,
    callbackURL: configAuth.garmin.redirectURL
},
function(accessToken, refreshToken, profile, cb) {
    // do stuff
});

client.userProfile = function (accesstoken, done) {
  // choose your own adventure, or use the Strategy's oauth client
  this._oauth2._request("GET", connect.garmin.com/.../info, null, null, accesstoken, (err, data) => {
    if (err) { return done(err); }
    try {
        data = JSON.parse( data );
    }
    catch(e) {
      return done(e);
    }
    done(null, data);
  });
};

passport.use(client);