$price = 50;
if ( $topicData['approved'] AND $this->memberData['points'] >= $price )
{
$this->DB->update( 'topics', array( 'last_post' => IPS_UNIX_TIME_NOW ), 'tid=' . $topicData['tid'] );
$this->DB->update( 'members', array( 'points' => $this->memberData['points'] - $price ), 'member_id=' . $this->memberData['member_id'] );
}