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# BillingEventType

The type of billing event for a campaign.

```
string BillingEventType
```

## Discussion

When the `supplySources` value is `APPSTORE_SEARCH_RESULTS` or `APPSTORE_SEARCH_TAB`, the `billingEvent` must be `TAPS.`

- IMPRESSIONS: The cost to the advertiser is per impression served.

## Discussion

See also [`Campaign`](/documentation/apple_ads/Campaign) object.

---

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