curl --request GET \
  --url http://localhost:3001/api/admin/users/subscriptions \
  --header 'Authorization: <api-key>'

{
  "workspaceId": "<string>",
  "userId": "<string>",
  "subscriptionGroups": [
    {
      "id": "<string>",
      "name": "<string>",
      "isSubscribed": true
    }
  ]
}