curl --request GET \
  --url https://api.attio.com/v2/{target}/{identifier}/attributes \
  --header 'Authorization: Bearer <token>'

{
  "data": [
    {
      "id": {
        "workspace_id": "14beef7a-99f7-4534-a87e-70b564330a4c",
        "object_id": "97052eb9-e65e-443f-a297-f2d9a4a7f795",
        "attribute_id": "41252299-f8c7-4b5e-99c9-4ff8321d2f96"
      },
      "title": "Company",
      "description": "A company attribute",
      "api_slug": "company",
      "type": "record-reference",
      "is_system_attribute": false,
      "is_writable": true,
      "is_required": false,
      "is_unique": false,
      "is_multiselect": false,
      "is_default_value_enabled": false,
      "is_archived": false,
      "default_value": null,
      "relationship": {
        "id": {
          "workspace_id": "14beef7a-99f7-4534-a87e-70b564330a4c",
          "object_id": "97052eb9-e65e-443f-a297-f2d9a4a7f795",
          "attribute_id": "41252299-f8c7-4b5e-99c9-4ff8321d2f96"
        },
        "object_slug": "companies",
        "title": "Team members",
        "api_slug": "team_members",
        "is_multiselect": true
      },
      "created_at": "2021-11-21T13:22:49.061Z",
      "config": {
        "currency": {
          "default_currency_code": null,
          "display_type": null
        },
        "record_reference": {
          "allowed_object_ids": [
            "companies"
          ]
        }
      }
    }
  ]
}