Coupon is TESTANDCODE
I had already used it before realising it was one or the other, honestly its one of the better TLD’s IMO, too bad Cloudflare doesn’t support it yet.
Edit: I should have mentioned, you have to make a tentative payment of 1 USD, which is reverted.
No, CloudFlare doesn’t support these TLD’s, but if they pick it up in the next year you’ll be able to before renewing.
It is likely however that CloudFlare will increase their TLD catalogue with Google Domains bowing out.
In the meantime, you can give CloudFlare your DNS in porkbun, which is what I’m doing.
They don’t yet support these TLDs, but according to this blog post they will be added very soon: