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.
```
https://app.adjust.com/{token}
```
Copy this token and assign it to the defaultTracker property of your config object.

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

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

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

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