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# CampaignTargetingUpdate.SupplySource

The supply source where an existing campaign’s ads are eligible to appear.

```
object CampaignTargetingUpdate.SupplySource
```

## Discussion

The `supplySource` field is **include-only**; setting `exclude` has no effect. Omit to leave unchanged. Valid values:

|Value     |Ad channel   |
|----------|-------------|
|`APPSTORE`|App Store ads|
|`MAPS`    |Apple Maps   |

Each source has its own set of placements. See [`CampaignTargetingUpdate.SupplyPlacement`](/documentation/Apple-Ads-Platform-API/CampaignTargetingUpdate/SupplyPlacement-data.dictionary) for the full placement list, and [`TargetingDataUpdate`](/documentation/Apple-Ads-Platform-API/TargetingDataUpdate) for the `include`/`exclude` shape.

---

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