Retrieve a conversation field

{
  "data": {
    "id": 102,
    "name": "Priority Level",
    "internal_name": "priority_level",
    "type": "dropdown",
    "description": "Priority level for tickets",
    "is_active": true,
    "is_default": false,
    "is_mandatory_on_close": true,
    "field_options": [
      {
        "id": 1,
        "name": "Low",
        "position": 1
      }
    ],
    "nested_fields": [
      {
        "id": 205,
        "name": "Category",
        "internal_name": "nested_level_102_1",
        "level": 1,
        "parent_id": 102,
        "options": [
          {
            "id": 11,
            "name": "Hardware",
            "position": 1,
            "parent_option_id": null
          }
        ]
      }
    ],
    "created_at": 1672531200,
    "updated_at": 1672535400
  }
}

{
  "error": {
    "message": "Conversation field with id 999 not found"
  }
}

{
  "error": {
    "message": "Error while fetching conversation field"
  }
}