POST to https://license.rankone.io/sign/ with the fields shown on that page.
The fields in the linked form that contain default values are optional, and will assume their default value unless otherwise specified. Long-term software deployments relying on this automated license signing server are advised to specify all fields explicity as the defaults may evolve over time.
$ curl -i --data 'username=brian&password=rockets123&customer=TurbidWatersSoftware&hostid="14:10:9f:d9:6c:ed"&expiry=2018-03-13&templates=100000' https://license.rankone.io/sign/
POST to https://license.rankone.io/sign/profile/ with the fields shown on that page.