code: private void handleGroupChannel(JsonNode channel) {
          long channelId = channel.get("id").asLong();
          if (!api.getGroupChannelById(channelId).isPresent()) {
              GroupChannel groupChannel = new GroupChannelImpl(api, channel);
              GroupChannelCreateEvent event = new GroupChannelCreateEventImpl(groupChannel);
  
              api.getEventDispatcher().dispatchGroupChannelCreateEvent(api, groupChannel.getMembers(), event);
          }
      }
docs: Handles a group channel creation.
  
  @param channel The channel data.