Has anyone installed or tried to install Cloudflare to help keep the hackers from blowing up your shopify cart by hacking away at making purchases and giving about 50 abandoned carts a day?
You would only be able to control your main domain.
Your *.myshopify.com domain is still controlled by Shopify and bots can put their order via that domain too.
You can only use Cloudfare as a proxy and it’s best to get a professional to handle this as the set-up can be tricky, but yeah there’s nothing you can do about protecting the actually checkout as this is hosted by Shopify on their servers.