Hi @nimonogi,
I’m not sure if you are not reading my entire message or not.
I clearly stated that you are using the official Cloudflare Plugin on your website (https://i.imgur.com/Lwo1FEx.jpeg), you need to uninstall the official Cloudflare plugin from your website and disable APO inside your Cloudflare dashboard if you have enabled it.
Regarding the cache rule, I’ve fixed the typo so you can just make /checkouts/
to /checkout/
beside that you do not need to make any changes. Use the Prevent the following URIs to be cached
section to bypass cache for certain URLs, no need to touch or modify the cache rule at all.