gistfile1.txt

add_action( "propertyhive_property_imported_rex_json", 'rex_import_stuff', 10, 2 );
function rex_import_stuff($post_id, $property)
{
    if ( isset($property['listing_agent_1']['name']) && $property['listing_agent_1']['name'] != '' )
    {
        $args = array(
            'post_type' => 'agent',
            's' => $property['listing_agent_1']['name'],
            'posts_per_page' => 1
        );
        $neg_query = new WP_Query( $args );
        if ( $neg_query->have_posts() )
        {
            while ( $neg_query->have_posts() )
            {
                $neg_query->the_post();
                update_post_meta($post_id, '_agent_id', get_the_ID());
            }
        }
    }
}