ASP.NET Web API 2 external logins with VK Vkontakte in AngularJS app

Question

I recently read Taiseer’s post on “ASP.NET Web API 2 external logins with Facebook and Google in AngularJS app”. I got my solution working perfectly with Google and Facebook. I decided to extend the project to support Vk. Does anyone know how I can obtain the user id and app id like the Google implementation. In the code below I’m trying to call a similar call like the one for Google and retrieve the user id and app id.?

else if (provider == "Google")
{
    verifyTokenEndPoint = string.Format(@"https://www.googleapis.com/oauth2/v1/tokeninfo?
    access_token={0}", accessToken);
}
else if (provider == "Vkontakte")
{
    verifyTokenEndPoint = string.Format(@"https://oauth.vk.com/access_token?
    client_id={0}&client_secret={1}&code={2}&redirect_uri=http://localhost:26264/signin-vkontakte");

}