Now I am using another plugin that is working fine and giving me the right results.
You can use the following plugin
‘WooCommerce Pay for Payment’ http://wordpress.org/plugins/woocommerce-pay-for-payment/
Hope it solves your problem too.
The code in functions.php goes like this…
add_submenu_page('edit.php?post_type=product', 'package', 'Package', 'manage_options', 'package_page', 'package_page_function');
function package_page_function() {
...............some code.........
}
