curl --request POST \
  --url https://api.attio.com/v2/{target}/{identifier}/attributes \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "data": {
    "title": "Your Attribute",
    "description": "Lorem ipsum",
    "api_slug": "my-attribute",
    "type": "text",
    "is_required": true,
    "is_unique": true,
    "is_multiselect": true,
    "default_value": {
      "type": "static",
      "template": [
        {
          "value": 5
        }
      ]
    },
    "config": {
      "currency": {
        "default_currency_code": "USD",
        "display_type": "symbol"
      },
      "record_reference": {
        "allowed_objects": [
          "people"
        ]
      }
    }
  }
}'

{
  "data": {
    "id": {
      "workspace_id": "14beef7a-99f7-4534-a87e-70b564330a4c",
      "object_id": "97052eb9-e65e-443f-a297-f2d9a4a7f795",
      "attribute_id": "41252299-f8c7-4b5e-99c9-4ff8321d2f96"
    },
    "title": "Rating",
    "description": "Rating of the record out of 5",
    "api_slug": "Rating",
    "type": "rating",
    "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": null,
    "created_at": "2021-11-21T13:22:49.061Z",
    "config": {
      "currency": {
        "default_currency_code": null,
        "display_type": null
      },
      "record_reference": {
        "allowed_object_ids": null
      }
    }
  }
}