Security for Ecommerce

Hello, I'm about to build a ecommerce site on laravel - cashier - using stripe (checkout js popup version)

• ddos protection
• white listing ips for admin portal
• code scanning / differential check
• on its own dedicated server / amazon
• ssl compliance
• // geo ip (ecommerce is available only in north america)
• google re-captcha on registration / user sign in forms
• using laravel auth for authentication

Is there anything you guys can suggest for adding another layer of security. cheers, Ali