code: public UserInfoResult[] getCrossBlacklist(String username)
              throws APIConnectionException, APIRequestException {
          StringUtils.checkUsername(username);
          ResponseWrapper response = _httpClient.sendGet(_baseUrl + crossUserPath + "/" + username + "/blacklist");
          return _gson.fromJson(response.responseContent, UserInfoResult[].class);
      }
docs: Get all user's info(contains appkey) of user's cross app blacklist
  @param username Necessary, the owner of blacklist
  @return UserInfo array
  @throws APIConnectionException connect exception
  @throws APIRequestException request exception