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

{
  "data": [
    {
      "createdAt": "2024-11-07T12:25:48.589Z",
      "description": "The email of the person",
      "environmentId": "cm37a748d0008hbwhqvvuba23",
      "id": "cm37a748d000ahbwhd5bbwc09",
      "isUnique": true,
      "key": "email",
      "name": "email",
      "type": "default",
      "updatedAt": "2024-12-03T13:30:28.620Z"
    }
  ]
}