private function _formatPayload($messages)
{
$requestData = array();
$topicData = array();
$partitionData[] = array('partition_id' => $this->partition, 'messages' => $messages);
$topicData[] = array('topic_name' => $this->topic, 'partitions' => $partitionData);
$requestData = array('required_ack' => $this->requiredAck, 'timeout' => $this->timeout, 'data' => $topicData);
return $requestData;
}