if( ! function_exists('product_service') ) {

    // Add Shortcode
    function product_service( $atts ) {
        global $woocommerce_loop;

        // Attributes 
        $atts = shortcode_atts(
            array(
                'columns'   => '4',
                'limit'     => '20',
            ),
            $atts, 'products_service'
        );


        $woocommerce_loop['columns'] = $atts['columns'];
        
        // The WP_Query
        $products = new WP_Query( array (
            'post_type'         => 'product',
            'post_status'       => 'publish',
            'posts_per_page'    => $atts['limit'],
			  'meta_key' => '_wss_type',
            'meta_value' => array('yes'), //'meta_value' => array('yes'),
   		    'meta_compare' => 'IN' //'meta_compare' => 'NOT IN'
			
        ));

        ob_start();

        if ( $products->have_posts() ) { ?>

            <?php woocommerce_product_loop_start(); ?>

                <?php while ( $products->have_posts() ) : $products->the_post(); ?>

                    <?php wc_get_template_part( 'content', 'product' ); ?>

                <?php endwhile; // end of the loop. ?>

            <?php woocommerce_product_loop_end(); ?>

            <?php
        } else {
            do_action( "woocommerce_shortcode_products_loop_no_results", $atts );
            echo "<p>There is no results.</p>";
        }

        woocommerce_reset_loop();
        wp_reset_postdata();

        return '<div class="woocommerce columns-' . $atts['columns'] . '">' . ob_get_clean() . '</div>';
    }

    add_shortcode( 'products_service', 'product_service' );
}