[1] [CITE@en[ACME v2 API Endpoint Coming January 2018 - Let's Encrypt - Free SSL/TLS Certificates]]
([TIME[2017-09-01 14:00:05 +09:00]])
<https://letsencrypt.org/2017/06/14/acme-v2-api.html>

[2] [CITE@en[ACME v2 and Wildcard Certificate Support is Live - Issuance Policy - Let's Encrypt Community Support]]
([TIME[2018-03-14 13:48:50 +09:00]])
<https://community.letsencrypt.org/t/acme-v2-and-wildcard-certificate-support-is-live/55579>