Longman\TelegramBot\Telegram::getApiKey PHP Method

    public function getApiKey()
    {
        return $this->api_key;
    }

 /**
  * Download file
  *
  * @param Entities\File $file
  *
  * @return boolean
  */
 public static function downloadFile(File $file)
 {
     $path = $file->getFilePath();
     //Create the directory
     $basepath = self::$telegram->getDownloadPath();
     $loc_path = $basepath . '/' . $path;
     $dirname = dirname($loc_path);
     if (!is_dir($dirname)) {
         if (!mkdir($dirname, 0755, true)) {
             throw new TelegramException('Directory ' . $dirname . ' can\'t be created');
         }
     }
     //Open file to write
     $fp = fopen($loc_path, 'w+');
     if ($fp === false) {
         throw new TelegramException('File can\'t be created');
     }
     $ch = curl_init();
     if ($ch === false) {
         throw new TelegramException('Curl failed to initialize');
     }
     $curlConfig = [CURLOPT_URL => 'https://api.telegram.org/file/bot' . self::$telegram->getApiKey() . '/' . $path, CURLOPT_RETURNTRANSFER => true, CURLOPT_HEADER => 0, CURLOPT_BINARYTRANSFER => true, CURLOPT_CONNECTTIMEOUT => 10, CURLOPT_FILE => $fp];
     curl_setopt_array($ch, $curlConfig);
     $result = curl_exec($ch);
     if ($result === false) {
         throw new TelegramException(curl_error($ch), curl_errno($ch));
     }
     //Close curl
     curl_close($ch);
     //Close local file
     fclose($fp);
     return filesize($loc_path) > 0;
 }