How to: Authentication hooks
- acme-dns-client with Certbot authentication hook: [https://github.com/acme-dns/acme-dns-client](https://github.com/acme-dns/acme-dns-client)
- Certbot authentication hook in Python:  [https://github.com/joohoi/acme-dns-certbot-joohoi](https://github.com/joohoi/acme-dns-certbot-joohoi)
- Certbot authentication hook in Go: [https://github.com/koesie10/acme-dns-certbot-hook](https://github.com/koesie10/acme-dns-certbot-hook)