{: .table .table-bordered .table-striped }
| Default Key | Scope | Description | Example |
|---|---|---|---|
hb_pb |
Required | The price bucket. Used by the line item to target. | 2.10 |
hb_adid |
Required | The ad Id. Used by the ad server creative to render ad. | 234234 |
hb_bidder |
Required | The bidder code. Used for logging and reporting to learn which bidder has higher fill rate/CPM. | rubicon |