A short verification routine.
THE SITE
Loads over https with no warning Inner pages load Images display Forms submit and the notification arrives
Send a message from a mailbox Receive a message to a mailbox
Mail is what breaks most often and is noticed least quickly.
ACCESS
cPanel loads FTP connects, if you use it
FOR A SHOP
Add to cart, check out, complete a real low-value payment, confirm the order updates, refund it.
SSL
No certificate warning AutoSSL still valid at our end
WHY THIS ROUTINE
Cloudflare changes have effects beyond the thing you changed. A proxy state altered on the wrong record breaks mail silently.
Five minutes of checking catches it immediately rather than three days later.
AFTER ANY SSL MODE CHANGE
Test in a private window, since browsers cache redirects.