List Posts For Sale

/**
 * Show Posts For Sale
 * Generates a list of posts that are set for sale using myCRED.
 * @version 1.0
 */
add_shortcode( 'posts_for_sale', 'mycred_pro_show_posts_for_sale' );
function mycred_pro_show_posts_for_sale( $atts, $content = '' ) {

    $args = array(
        'post_type'    => 'post',
        'post_status'  => 'publish',
        'meta_query'   => array(
            array(
                'key'     => 'myCRED_sell_content',
                'compare' => 'EXISTS'
            ),
            array(
                'key'     => 'myCRED_sell_content',
                'value'   => '"status";s:7:"enabled"',
                'compare' => 'LIKE'
            )
        )
    );

    $for_sale = new WP_Query( $args );

    ob_start();

    if ( $for_sale->have_posts() ) {

?>
<ul>
<?php

        while ( $for_sale->have_posts() ) {

            $for_sale->the_post();

?>
    <li><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></li>
<?php

        }

?>
</ul>
<?php

    }
    else {

?>
<p>No posts are for sale at the moment.</p>
<?php

    }

    $content = ob_get_contents();
    ob_end_clean();

    wp_reset_postdata();

    return $content;

}