Update Custom Field

{
  "name": "Updated Priority Level",
  "multi_select_options": [
    "Urgent",
    "High",
    "Medium",
    "Low",
    {
      "value": "Deferred"
    }
  ]
}

{
  "data": {
    "id": "field_99999",
    "name": "Updated Priority Level",
    "field_type": "SINGLE_SELECT",
    "entity_type": "CONTACT",
    "created_at": "2025-01-15T10:30:00Z",
    "updated_at": "2025-01-15T12:45:00Z",
    "multi_select_options": [
      {
        "id": "option_401",
        "value": "Deferred"
      },
      {
        "id": "option_402",
        "value": "High"
      },
      {
        "id": "option_403",
        "value": "Low"
      },
      {
        "id": "option_404",
        "value": "Medium"
      },
      {
        "id": "option_405",
        "value": "Urgent"
      }
    ]
  }
}