Enable Auto Purge
If you enable this option the plugin will purge the cache on Cloudflare as well when it clears plugin cache. It is recommended to enable this option if you are using Cloudflare with caching.

Cloudflare Account E-mail
Your e-mail address which is related to the Cloudflare account that you are using for the site.

Cloudflare API Key
The generated API key for your Cloudflare account. Global API key