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Adding a domain was a manual per-domain script run. With domains arriving continuously that does not hold, so certificate issuance is now automatic. HTTP already needed no work: the nginx catch-all serves any Host and the SPA resolves its tenant from that header. Only TLS needed a name-by-name step. Two mechanisms: - setup-wildcard-tls.sh issues one DNS-01 wildcard for *.<apex>, after which a new tenant subdomain is live over HTTPS with zero certificate work. - sync-domains.sh reconciles tenant-owned domains against a desired list on a 10-minute timer: issues what is missing, skips certificates with >30 days left, skips names already covered by the wildcard, waits out unpropagated DNS, and caps issuance per run so a bad source cannot burn the weekly ACME budget. Safety properties worth stating: a failed fetch of the desired list aborts the run rather than reading as "remove every domain"; removing a domain disables its server block but keeps the certificate, so re-adding is instant; malformed hostnames are rejected before reaching certbot or an nginx server_name. The source is pluggable - a file today, the Phase 9 domain registry once it exists, whose MarketplaceDomain statuses already match what this needs. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>