curl --request GET \
  --url https://{baseurl}/api/v1/management/contact-attributes \
  --header 'x-api-key: <x-api-key>'

{
  "data": [
    {
      "attributeKeyId": "cm4jnsxxh00ukh3aq08gpdafw",
      "contactId": "cm4jnsxcd00ufh3aqz1b6zox6",
      "createdAt": "2024-12-11T08:59:38.309Z",
      "id": "cm4jnsxxh00umh3aq76q08ah1",
      "updatedAt": "2024-12-11T08:59:38.309Z",
      "value": "eight"
    }
  ]
}