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To be allowed to use the API calls for handling certificates, you must edit the appropriate Organization or Department object, and on the SSL Certificate tab, enable the Web API checkbox. You will be required to provide a value for the Secret Key field too. Enter a good random value there and promptly forget it. As far as we are aware, that secret is not used for the current REST API.

ACME support

There is support for ACME and some of the test members have started to try that. We will update this section as we get feedback.