Send preinstalled app activity

You can use the Adjust SDK to record activity from apps that came preinstalled on a user’s device. This enables you to send information from users who didn’t download your app from a campaign.

Configuring a default link token enables you to attribute all preinstalls to a predefined Adjust link. Adjust records all information against this token until the attribution source changes. To set this up:

Create a new campaign link in Campaign Lab.
```
1
https://app.adjust.com/{token}
```
Copy this token and assign it to the defaultTracker property of your config object.

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let yourAppToken = "{YourAppToken}"
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let environment = ADJEnvironmentSandbox as? String
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let adjustConfig = ADJConfig(
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   appToken: yourAppToken,
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   environment: environment)
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adjustConfig?.defaultTracker = "{Token}"
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Adjust.appDidLaunch(adjustConfig)

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*adjustConfig = [ADJConfig configWithAppToken:@"{YourAppToken}"
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                                 environment:ADJEnvironmentSandbox];
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[adjustConfig setDefaultTracker:@"{Token}"];
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[Adjust appDidLaunch:adjustConfig];

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setupWebViewJavascriptBridge(function (bridge) {
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   var yourAppToken = yourAppToken;
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   var environment = AdjustConfig.EnvironmentSandbox;
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   var adjustConfig = new AdjustConfig(yourAppToken, environment);
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   adjustConfig.setDefaultTracker("{Token}");
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});

Build and run your app. If you have logging enabled, you should see a message in your log
```
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Default tracker: 'abc123'.
```