code: static function getPaths()
      {
          if (self::$paths === null) {
              if (self::$useExternalFile) {
                  try {
                      $baseFolder = sys_get_temp_dir();
                      $file = self::createExternalCaFile($baseFolder);
                      $folder = self::createExternalCaFolder($baseFolder);
                  }
                  catch (\Exception $ex) {
                      throw new \Exception("Unable to create external root certificate file and folder: ".$ex->getMessage());
                  }
              }
              else {
                  if (substr(__DIR__, 0, 7) === 'phar://') {
                      throw new \Exception("The code appears to be running in a PHAR.  You need to call \\Dropbox\\RootCertificates\\useExternalPaths() before making any API calls.");
                  }
                  $file = __DIR__.self::$originalPath;
                  $folder = \dirname($file);
              }
              self::$paths = array($file, $folder);
          }
  
          return self::$paths;
      }
docs: @internal
  
  @return string[]
  A tuple of (rootCertsFilePath, rootCertsFolderPath).  To be used with cURL options CAINFO and CAPATH.