Contains data of the items purchased.

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

| Fields ||
|---|---|
| ## `product_id` | `string` The shopping id of the item. Must be equal to the Merchant Center product identifier. |
| ## `quantity` | `int32` Number of items sold. |
| ## `unit_price` | `double` Unit price excluding tax, shipping, and any transaction level discounts. The currency code is the same as that in the `ClickConversion` message. |