Updated dnsapi (markdown)

dnsapi.md

@@ -3012,6 +3012,25 @@ The `BUNNY_API_KEY` will be saved in `~/.acme.sh/account.conf` and will be reuse
 
 If you find any bugs with the Bunny DNS API integration, please report them here: https://github.com/Neilpang/acme.sh/issues/4296
 
+## 151. Use Selfhost DNS API
+
+- create a new TXT record for a subdomainname with the needed prefix e.g. "_acme-challenge.example.com" (default) or "alias.example.com" (dns alias mode)
+  - for wildcard subdomains add a second TXT record for the identical subdomainname
+- edit the TXT record and note the ID in (...) behind the subdomainname
+- export each subdomainname (including the prefix) and the corresponding record IDs in SELFHOSTDNS_MAP like "subdomainname:RID1:RID2"
+  - at least one RID must be set, up to two are supported for wildcard subdomains
+  - each entry must be seperated by a space
+- export username and password in SELFHOSTDNS_USERNAME and SELFHOSTDNS_PASSWORD
+
+_Note: For `username` you have to use your account / customer number. You can find them in any invoice or on the right top of the selfhost dashboard._
+
+```
+export SELFHOSTDNS_USERNAME="myname"
+export SELFHOSTDNS_PASSWORD="mypass"
+export SELFHOSTDNS_MAP="_acme-challenge.example.com:12345:98765 alias.example.com:11111"
+
+acme.sh --issue -d example.com --dns dns_selfhost
+```
 
 # ##################
 # Use custom API