code: public String redirectUrl(String token) {
          return play.shaded.oauth.oauth.signpost.OAuth.addQueryParameters(
                  provider.getAuthorizationWebsiteUrl(),
                  play.shaded.oauth.oauth.signpost.OAuth.OAUTH_TOKEN,
                  token
          );
      }
docs: The URL where the user needs to be redirected to grant authorization to your application.
  
  @param token request token
  @return the url