Barcode info to generate promotion barcode.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v26/common/asset_types.proto)

| Fields ||
|---|---|
| ## `barcode_content` | `string` Promotion message to be encoded in the barcode. |
| ## `type` | `https://developers.google.com/google-ads/api/reference/rpc/v26/PromotionBarcodeTypeEnum.PromotionBarcodeType` Barcode type used to generate barcode with the correct format. |