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.
It’s been active for longer than that, it’s unlikely that you would have gotten it for free without letting it lapse, losing it and then buying it fresh on porkbun.