code: public String getMaskedApiKey(int count)
      {
          if(apiKey != null)
              return StringUtils.overlay(apiKey, StringUtils.repeat("X", apiKey.length()-count), 0, apiKey.length()-count);
          return null;
      }
docs: Returns the API key used to authenticate the clients (masked except for the last n digits).
  @param count The number of right-hand digits to retain after masking
  @return the API key used to authenticate the clients