{
  "summary": "Bulk create custom fields",
  "method": "POST",
  "path": "/v4/bulk/custom_fields",
  "tag": "Custom Fields",
  "request_body": {
    "custom_fields": [
      {
        "label": "string"
      }
    ],
    "callback_url": "string"
  },
  "response": {
    "custom_fields": [
      {
        "id": 1,
        "label": "string",
        "key": "string",
        "name": "string",
        "created_at": "string"
      }
    ],
    "failures": [
      null
    ]
  }
}