Add DNScale API documentation

dnsapi2.md

@@ -130,6 +130,7 @@
 - [206. Use cPanel UAPI DNS](#dns_cpanel_uapi)
 - [207. Use sitehost.nz DNS API](#dns_sitehost)
 - [208. Use EuroDNS DNS API](#dns_eurodns)
+- [209. Use DNScale DNS API](#dns_dnscale)
 - [Use custom API](#dns_myapi)
 
 
@@ -3310,6 +3311,31 @@ Let's assume you want to name it `myapi`:
 ./acme.sh --issue --dns dns_myapi -d example.com -d *.example.com
 ```
 
+<a name="dns_dnscale"/>
+
+## 209. Use DNScale DNS API
+
+[DNScale](https://dnscale.eu) is an EU-based authoritative DNS hosting platform with a
+REST API. Authentication is a single bearer token — there's no separate client ID.
+
+Create an API token at the [DNScale dashboard](https://app.dnscale.eu) under **API
+Keys**. Grant it the scopes `zones:read`, `records:read`, and `records:write`. Scope
+the token to the specific zone(s) you'll be issuing certs for when possible.
+
+```sh
+export DNSCALE_Token="your_api_token"
+
+acme.sh --issue --dns dns_dnscale -d example.com -d *.example.com
+
+An optional DNSCALE_Api variable overrides the API base URL (defaults to
+https://api.dnscale.eu).
+
+The DNSCALE_Token (and DNSCALE_Api if set) is saved to ~/.acme.sh/account.conf on first
+use, so subsequent renewals don't need the env vars.
+
+Report any bugs or issues here: https://github.com/acmesh-official/acme.sh/issues/6909
+```
+
 ## Wiki documentation for dnsapi2
 Please add the following to the [dnsapi2 wiki page](https://github.com/acmesh-official/acme.sh/wiki/dnsapi2):