Trying to edit the primary payment method, or add a backup fails with a red bar at the bottom of the screen and message “Internal Server Error (Code: 1000)”.
It’s been 11 hours. Is it working now? If not, open a Ticket for Billing.
To contact Cloudflare Customer Support, login & go to https://dash.cloudflare.com/?account=support and select get more help. If you receive an automatic response that does not help you, please reply and indicate you need more help.