Please go to Disqus API resources applications page http://disqus.com/api/applications/ in the API access tab, create a new client ID, and in the line 23 set the client_id to Public Key and client_secret with Secret Key. The callback URL must be http://erp.leaf.com.my/webmail/modules/OAuthIntegratorWebclient/Classes/OAuthClient/login_with_disqus.php