code: public String storeData(String cookieData) {
          try {
              String token = generateToken();
              ensureSpaceExists();
              s3StorageProvider.addHiddenContent(this.hiddenSpaceName, token, Constants.MEDIA_TYPE_APPLICATION_JSON,
                                                 IOUtil.writeStringToStream(cookieData));
              return token;
          } catch (Exception e) {
              throw new DuraCloudRuntimeException(e);
          }
      }
docs: Stores string data and returns a token by which that data can be retrieved
  
  @param cookieData serialized cookie data
  @return alphanumeric token value by which data can be retrieved