If you see this Cloudflare error: Access denied Error code 1020 when trying to save BPS Custom Code, do these steps in this Cloudflare help link to prevent Cloudflare from caching your wp-admin area and applying security rules to your wp-admin area > https://support.cloudflare.com/hc/en-us/articles/200169526-Disabling-Cloudflare-features-on-admin-pages-for-content-management-systems-like-WordPress