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# init(displayName:developerName:identifier:storeIdentifier:)

Initializes an extension with its identifying information and App Store reference.

```
init(displayName: String, developerName: String, identifier: String, storeIdentifier: String)
```

## Parameters

`displayName`

The localized display name of the extension.

`developerName`

The name of the extension’s developer.

`identifier`

A unique identifier for the extension.

`storeIdentifier`

The App Store identifier for the extension, or `nil` if not available.

---

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