public function was_match_condition_contains_shipping_class( $match, $operator, $value, $package ) {

        // True until proven false
        if ( $operator == '!=' ) :
            $match = true;
        endif;

        foreach ( $package['contents'] as $key => $product ) {
            do_action( 'woocommerce/cart_loop/start', $product  );
            $id      = ! empty( $product['variation_id'] ) ? $product['variation_id'] : $product['product_id'];
            $product = wc_get_product( $id );

            if ( $operator == '==' ) {
                if ( $product->get_shipping_class() == $value ) {
                    do_action( 'woocommerce/cart_loop/end', $product  );
                    return true;
                    }
            }
            elseif ( $operator == '!=' ) {
                if ( $product->get_shipping_class() == $value ) {
                    do_action( 'woocommerce/cart_loop/end', $product  );
                    return false;
                }

            }
            do_action( 'woocommerce/cart_loop/end', $product  );
        }

        return $match;

    }