def additional_params
      @additional_params ||= if session_scope?
        if oauth2_session?
          {application_key: application_key}
        else
          {application_key: application_key, session_key: options[:session_key]}
        end
      else
        {application_key: application_key}
      end
    end
def additional_params
      @additional_params ||= if session_scope?
        if oauth2_session?
          {application_key: application_key}
        else
          {application_key: application_key, session_key: options[:session_key]}
        end
      else
        {application_key: application_key}
      end
    end
Returns additional params which are required for all requests.
 Depends on request scope.

 @return [Hash]