Options to control how to override the default behavior of the specified modifier.
| Name | Type | Description | Notes |
|---|---|---|---|
| modifier_id | String | The ID of the `CatalogModifier` whose default behavior is being overridden. | |
| on_by_default | Boolean | If `true`, this `CatalogModifier` should be selected by default for this `CatalogItem`. | [optional] |