In the interim, you may be able to use any ACME client manually to obtain a wildcard certificate.
The plus is that you will have 90 days to figure out how DirectAdmin can obtain wildcard certs.
The minus is that obtaining a cert manually won't be something you can automate [easily] and you will have to insert that cert into your system manually.
And... you will only have 90 days [max] before that wildcard cert will expire.
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