Piwik\Plugins\Marketplace\Api\Service::getVersion PHP Method

    public function getVersion()
    {
        return $this->version;
    }

 private function getCacheKey($action, $query)
 {
     $version = $this->service->getVersion();
     return sprintf('marketplace.api.%s.%s.%s', $version, str_replace('/', '.', $action), md5($query));
 }