$homeawayLink = get_post_meta(get_the_id(),'property_listing_url',true);
if($homeawayLink){
$aff_prefix = get_option("hakem_homeaway_vrbo_aff_link");
//"http://www.dpbolvw.net/click-1022679-10859114?url="
$afflink = $aff_prefix . $homeawayLink;
}
?>
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