Airship\Engine\Continuum\API::get PHP Method

    public static function get(string $key, $version = self::API_VERSION) : string
    {
        static $cache = [];
        if (empty($cache[$version])) {
            $cache[$version] = self::getAll($version);
        }
        return isset($cache[$version][$key]) ? $cache[$version][$key] : '';
    }

 /**
  * Are any updates available?
  *
  * @param string $supplier
  * @param string $packageName
  * @param string $minVersion
  * @param string $apiEndpoint
  *
  * @return UpdateInfo[]
  *
  * @throws \Airship\Alerts\Hail\NoAPIResponse
  */
 public function updateCheck(string $supplier = '', string $packageName = '', string $minVersion = '', string $apiEndpoint = 'version') : array
 {
     if (empty($supplier)) {
         $supplier = $this->supplier->getName();
     }
     $channelsConfigured = $this->supplier->getChannels();
     if (empty($channelsConfigured)) {
         throw new NoAPIResponse(\trk('errors.hail.no_channel_configured'));
     }
     foreach ($channelsConfigured as $channelName) {
         $channel = $this->getChannel($channelName);
         $publicKey = $channel->getPublicKey();
         foreach ($channel->getAllURLs() as $ch) {
             try {
                 $response = $this->hail->postSignedJSON($ch . API::get($apiEndpoint), $publicKey, ['type' => $this->type, 'supplier' => $supplier, 'package' => $packageName, 'minimum' => $minVersion]);
                 if ($response['status'] === 'error') {
                     $this->log($response['error'], LogLevel::ERROR, ['response' => $response, 'channel' => $ch, 'supplier' => $supplier, 'type' => $this->type, 'package' => $packageName]);
                     continue;
                 }
                 $updates = [];
                 foreach ($response['versions'] as $update) {
                     $updates[] = new UpdateInfo($update, $ch, $publicKey, $supplier, $packageName);
                 }
                 if (empty($updates)) {
                     $this->log('No updates found.', LogLevel::DEBUG, ['type' => \get_class($this), 'supplier' => $supplier, 'package' => $packageName, 'channelName' => $channelName, 'channel' => $ch]);
                     return [];
                 }
                 return $this->sortUpdatesByVersion(...$updates);
             } catch (SignatureFailed $ex) {
                 // Log? Definitely suppress, however.
                 $this->log('Automatic update - signature failure. (' . \get_class($ex) . ')', LogLevel::ALERT, ['exception' => \Airship\throwableToArray($ex), 'channelName' => $channelName, 'channel' => $ch]);
             } catch (TransferException $ex) {
                 // Log? Definitely suppress, however.
                 $this->log('Automatic update failure. (' . \get_class($ex) . ')', LogLevel::WARNING, ['exception' => \Airship\throwableToArray($ex), 'channelName' => $channelName, 'channel' => $ch]);
             }
         }
     }
     throw new NoAPIResponse(\trk('errors.hail.no_channel_responded'));
 }