DNS01Provider
DNS-01 providers in v1: Cloudflare's API and generic RFC 2136. HTTP-01 and TLS-ALPN-01 are not offered.
stringDNS01Provider
DNS-01 providers in v1: Cloudflare's API and generic RFC 2136. HTTP-01 and TLS-ALPN-01 are not offered.
Possible values: [cloudflare, rfc2136]
DNS01Provider
"cloudflare"