# Configuring a source app Set up a source app to participate in ad campaigns. ## Discussion A *source app* is an app that participates in ad campaigns by displaying ads that an ad network signs. To participate in install validation, the source app needs to include ad network IDs in its `Info.plist` file. Ad networks are responsible for publishing or providing their ad network IDs to developers. Only ads from ad networks that have an entry in the app’s `Info.plist` file are eligible for install validation. To work with multiple ad networks, include each of the ad network IDs in the source app’s `Info.plist` file, as follows: 1. Select `Info.plist` in the Project navigator in Xcode. 2. Click the Add button (+) beside a key in the property list editor and press Return. 3. Type the key name . 4. Choose Array from the pop-up menu in the Type column. Create an array that contains one dictionary for each allowed ad network, using the single key . The string value for the key is the ad network ID. > Important: > Lowercase the ad network ID string; otherwise, the system doesn’t recognize it as valid. The following example shows an array with two dictionaries that represent the example ad network IDs `example100.skadnetwork` and `example200.skadnetwork`: ```xml SKAdNetworkIdentifier example100.skadnetwork SKAdNetworkIdentifier example200.skadnetwork ``` For more information about property lists, see [Edit property lists](https://help.apple.com/xcode/mac/current/#/dev3f399a2a6). --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)