code: private void invokeAuthorizationRequest(Context context) {
  
          AuthorizationRequestManager.RequestOptions options = new AuthorizationRequestManager.RequestOptions();
  
          options.parameters = createAuthorizationParams();
          options.headers = new HashMap<>(1);
          addSessionIdHeader(options.headers);
          options.requestMethod = Request.GET;
  
          InnerAuthorizationResponseListener listener = new InnerAuthorizationResponseListener() {
              @Override
              public void handleAuthorizationSuccessResponse(Response response) throws Exception {
  
                  String location = extractLocationHeader(response);
                  String grantCode = extractGrantCode(location);
                  invokeTokenRequest(grantCode);
              }
          };
  
          authorizationRequestSend(context, "authorization", options, listener);
      }
docs: Invoke the authorization request, the result of the request should be a grant code
  @param context android activity that will handle authentication (facebook, google)