code: def fetchAllUsers(self):
          
          data = {"viewer": self._uid}
          j = self._post(
              self.req_url.ALL_USERS, query=data, fix_request=True, as_json=True
          )
          if j.get("payload") is None:
              raise FBchatException("Missing payload while fetching users: {}".format(j))
  
          users = []
          for data in j["payload"].values():
              if data["type"] in ["user", "friend"]:
                  if data["id"] in ["0", 0]:
                      # Skip invalid users
                      continue
                  users.append(User._from_all_fetch(data))
          return users
docs: Gets all users the client is currently chatting with
  
          :return: :class:`models.User` objects
          :rtype: list
          :raises: FBchatException if request failed