title: Force re-authentication using OAuthWebSecurity with Facebook
body: <p>My website is using facebook as it's oauth provider.  Users will be able to buy things through my site so I want to force them to authenticate even if they already have an active session with facebook.</p>
  
  <p>I found this <a href="https://developers.facebook.com/docs/facebook-login/reauthentication/" rel="nofollow">link in facebook's api documentation</a> that discusses reauthentication but I can't get it to work with my mvc app.  Anyone know if this is possible?</p>
  
  <pre><code>var extra = new Dictionary&lt;string, object&gt;();
  extra.Add("auth_type", "reauthenticate");
  
  OAuthWebSecurity.RegisterFacebookClient(
              appId: "**********",
              appSecret: "**********************",
              displayName: "",
              extraData: extra);  
  </code></pre>