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                        ISPConfig remote user needs more permissions
Added line to first comment, DNS txt functions were not enough on my new ISPConfig installation. Maybe ISPConfig behaviour changed, using debug I found out that the remote user did not have permission to execute client_get_id I also have DNS zone function permissions, though I do not know if that is actually necessary
can you please update the comments into the usage:
https://github.com/acmesh-official/acme.sh/wiki/dnsapi#12-use-ispconfig-31-api