Not connecting to API anymore

Hello! I found today that the sites using your plugin are not being able to connect to the Cloudflare API. May have changed something in the API methods itselves?
Can you check it out?

The plugin UI just says: CloudFlare test not passed!

This is happenning in a lot of sites in several, different servers, so it must be a change in the API.

Can you check it out please?
Thank you in advance!