Get available features

curl -X GET \
 /subscriptions/{id}/available-features \
 --header "Authorization: Bearer <token>"

{
  "data": [
    {
      "entitlementId": "<string>",
      "featureId": "<string>",
      "featureName": "<string>",
      "entitlementValue": "<string>"
    }
  ],
  "meta": {
    "pagination": {
      "totalItems": 123,
      "itemsPerPage": 123,
      "currentPage": 123,
      "lastPage": 123,
      "pageTotalItems": 123
    }
  }
}