curl --request GET \
  --url https://api.hyperline.co/v1/custom-properties \
  --header 'Authorization: Bearer <token>'

{
  "meta": {
    "total": 1,
    "taken": 1,
    "skipped": 0,
    "approximateCount": false
  },
  "data": [
    {
      "id": "cfi_efnjehRH304",
      "name": "Test custom property",
      "slug": "test_custom_property",
      "type": "date",
      "entities": [
        "customer"
      ],
      "authorized_values": [
        "<string>"
      ],
      "api_only": false,
      "created_at": "2024-01-01T22:00:00Z",
      "updated_at": "2024-01-01T22:00:00Z"
    }
  ]
}