Every endpoint here needs a superadmin session; see API overview for how to
authenticate. Every change is in the audit log.
Overview
Accounts
ca is letsencrypt, letsencrypt-staging, zerossl or custom (with directory_url).
DNS credentials
provider is dnz, cloudflare, rfc2136, webhook or manual. The config for each is in
DNS credentials. Secrets are never returned: answers show
token_set / secret_set instead.