Piwik\API\Proxy::isExistingApiAction PHP Метод

    public function isExistingApiAction($pluginName, $apiAction)
    {
        $namespacedApiClassName = "\\Piwik\\Plugins\\{$pluginName}\\API";
        $api = $namespacedApiClassName::getInstance();
        return method_exists($api, $apiAction);
    }