curl --request GET \
  --url https://saas.pads365.com/rdx/NDS.Services.Viewer/api/v1/Viewer/Cluster/Viewers

{
  "Succeeded": true,
  "Message": "<string>",
  "Code": "<string>",
  "Viewers": [
    {
      "Id": "<string>",
      "ClusterId": "<string>"
    }
  ]
}