Update settings (auto-renew, registrar lock, WHOIS privacy) for up to 100 domains in a single request. Only the fields included for each domain are updated; omitted fields remain unchanged. Each domain is processed independently so a failure on one domain does not affect the others. The response contains one result per input domain, in the same order as the request. A failed entry carries the same {"error_string", "extra"} body the single-domain endpoint would have returned, under error.