<?php
$args = array(
'post_type' => 'product',
'meta_key' => 'total_sales',
'orderby' => 'meta_value_num',
'posts_per_page' => 1,
);
$loop = new WP_Query( $args );
while ( $loop->have_posts() ) : $loop->the_post();
global $product; ?>
<a...