public override void Configuration(IAppBuilder app)
        {
            //ensure the default options are configured
            base.Configuration(app);

            // facebook
            app.ConfigureBackOfficeFacebookAuth(
                "1073792385982685",
                "08c7b982b4a7b5e0915df2d4bd694605");

            // google
            app.ConfigureBackOfficeGoogleAuth(
                "993945723931-4gss3ebpi52duai8ple7db6gm2s6344j.apps.googleusercontent.com",
                "82SamaeOXFCOB9bTCWK1UFdj");

            // microsoft
            app.ConfigureBackOfficeMicrosoftAuth(
                "000000004C15527C",
                "UhwYDa2Aid6fr65Pk-AdEtV6mkh0dKez");

            /*
             * Configure external logins for the back office:
             *
             * Depending on the authentication sources you would like to enable, you will need to install
             * certain Nuget packages.
             *
             * For Google auth:					Install-Package UmbracoCms.IdentityExtensions.Google
             * For Facebook auth:					Install-Package UmbracoCms.IdentityExtensions.Facebook
             * For Microsoft auth:					Install-Package UmbracoCms.IdentityExtensions.Microsoft
             * For Azure ActiveDirectory auth:		Install-Package UmbracoCms.IdentityExtensions.AzureActiveDirectory
             *
             * There are many more providers such as Twitter, Yahoo, ActiveDirectory, etc... most information can
             * be found here: http://www.asp.net/web-api/overview/security/external-authentication-services
             *
             * For sample code on using external providers with the Umbraco back office, install one of the
             * packages listed above to review it's code samples
             *
             */

            /*
             * To configure a simple auth token server for the back office:
             *
             * By default the CORS policy is to allow all requests
             *
             *      app.UseUmbracoBackOfficeTokenAuth(new BackOfficeAuthServerProviderOptions());
             *
             * If you want to have a custom CORS policy for the token server you can provide
             * a custom CORS policy, example:
             *
             *      app.UseUmbracoBackOfficeTokenAuth(
             *          new BackOfficeAuthServerProviderOptions()
             *              {
             *             		//Modify the CorsPolicy as required
             *                  CorsPolicy = new CorsPolicy()
             *                  {
             *                      AllowAnyHeader = true,
             *                      AllowAnyMethod = true,
             *                      Origins = { "http://mywebsite.com" }
             *                  }
             *              });
             */
        }