Enable the ability for Customers - Cloudflare DNS Integration

Enable the ability for Customers to use the Cloudflare DNS Integration

They can already, if they create their own API key and configure their own integration.
.. unless I am missing something.

This is currently possible.
If you mean in the sense of you want to use YOUR API key on their account, this is also doable.

I made a tutorial you can replicate for your customers if you want:
https://webv8.net/posts/add-cloudflare-to-web-v8/

slimx if you can repost it here since your website seems broken