Bulk create custom fields Request

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/convertkit/main/json-schema/bulk_create_custom_fields_request.json",
  "title": "Bulk create custom fields Request",
  "x-tag": "Custom Fields",
  "type": "object",
  "properties": {
    "custom_fields": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "label": {
            "type": "string"
          }
        },
        "required": [
          "label"
        ]
      }
    },
    "callback_url": {
      "type": "string",
      "nullable": true
    }
  },
  "required": [
    "custom_fields"
  ]
}