add_action('wp_ajax_cod_save_order','cod_save_order');
add_action('wp_ajax_nopriv_cod_save_order','cod_save_order');

function cod_save_order(){

global $wpdb;

$table = $wpdb->prefix . "cod_orders";

$wpdb->insert($table,[
'name'=>sanitize_text_field($_POST['name']),
'phone'=>sanitize_text_field($_POST['phone']),
'city'=>sanitize_text_field($_POST['city']),
'address'=>sanitize_textarea_field($_POST['address']),
'quantity'=>intval($_POST['quantity'])
]);

echo "success";
wp_die();

}<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="https://bimbimo.com/wp-sitemap-index.xsl" ?>
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"><sitemap><loc>https://bimbimo.com/wp-sitemap-posts-page-1.xml</loc></sitemap><sitemap><loc>https://bimbimo.com/wp-sitemap-posts-product-1.xml</loc></sitemap><sitemap><loc>https://bimbimo.com/wp-sitemap-taxonomies-product_cat-1.xml</loc></sitemap><sitemap><loc>https://bimbimo.com/wp-sitemap-users-1.xml</loc></sitemap></sitemapindex>