NLB-6987: Document steps to access module versions through Dataplane API

Author: xynicole

content/nginxaas-azure/module-changelog.md

@@ -8,6 +8,44 @@ url: /nginxaas/azure/module-changelog/
 Learn about the modules supported by the latest versions of F5 NGINX as a Service for Azure.
 
 
+## Accessing Module Versions via Dataplane API:
+
+To access available module versions from the dataplane API, follow these steps:
+- View Your API Endpoints and Create an API Key
+  - Follow the [Getting Started instructions]({{< ref "/nginxaas-azure/loadbalancer-kubernetes.md#getting-started" >}}) to locate your dataplane API endpoint and create an API key
+
+- Construct the Request URL
+   - Add `/packages` to your dataplane API endpoint.
+   - Example: `https://<your-endpoint>/packages`
+
+- Authenticate API Requests
+   - Base64 encode your API key and add prefix `ApiKey` to the encoded string.
+   - Set the `Authorization` HTTP header to:  
+     `ApiKey <your_api_key>`
+
+
+```bash
+   curl -H "Authorization: ApiKey <your_api_key>" https://<your-endpoint>/packages
+```
+
+Response Example:
+```json
+{
+  "packages": [
+    {
+      "name": "nginx-plus-module-headers-more",
+      "version":"35+0.37-1~jammy"
+    },
+    {
+      "name": "nginx-plus-module-otel",
+      "version": "35+0.1.2-1~jammy"
+    },
+    ...
+  ]
+}
+```
+
+
 ## July 03, 2025 
 
 ### Stable