protected function getApiRequestParams(Event $event)
    {
        $params = $event->getCustomParams();
        $user = $params[0];

        return array(
            'format' => 'json',
            'api_key' => $this->apiKey,
            'method' => 'user.getrecenttracks',
            'user' => $user,
            'limit' => '1'
        );
    }