Buypass ACME implementation:

ACME (IETF-standard https://tools.ietf.org/html/rfc8555)

Has support for up to 5 domains in a certificate (wildcard not supported)

Production:
https://api.buypass.com/acme/directory

Test environment:
https://api.test4.buypass.no/acme/directory

Updated: 14.05.2020 - Changes to wildcard and amount of domains