# MarketplaceAppExtension An extension that facilitates authentication, installation, and launch of a marketplace with deep links. ``` protocol MarketplaceAppExtension : AppExtension, Sendable ``` ## Overview You provide this extension to enable the operating system to facilitate some tasks for your app even if it isn’t running, such as: - Automatically updating apps when a new version is available. - Providing additional header text for communications with your marketplace server. - Launching your app storefront for a specific app. - Handling failures in requests to your marketplace server. ### Define the extension point identifier To set up your marketplace extension in Xcode, use a generic extension template and set the `EXExtensionPointIdentifier` key in the `Info.plist` file to `com.apple.marketplace.extension`: ``` EXAppExtensionAttributes EXExtensionPointIdentifier com.apple.marketplace.extension ``` ## Topics ### Instance Methods [`func additionalHeaders(for: URLRequest, account: String) async -> [String : String]`](/documentation/MarketplaceKit/MarketplaceAppExtension/additionalHeaders(for:account:)) Adds information to the request header for communications from the operating system to your marketplace endpoints. [`func automaticUpdates(for: [AppVersion]) async throws -> [AutomaticUpdate]`](/documentation/MarketplaceKit/MarketplaceAppExtension/automaticUpdates(for:)) [`func availableAppVersions(forAppleItemIDs: [AppleItemID]) async -> [AppVersion]`](/documentation/MarketplaceKit/MarketplaceAppExtension/availableAppVersions(forAppleItemIDs:)) [`func requestFailed(response: HTTPURLResponse) async -> Bool`](/documentation/MarketplaceKit/MarketplaceAppExtension/requestFailed(response:)) Handles when the operating system receives an unexpected response from your web server. ## Relationships ### Inherits From [`AppExtension`](/documentation/ExtensionFoundation/AppExtension) [`SendableMetatype`](/documentation/Swift/SendableMetatype) [`Sendable`](/documentation/Swift/Sendable) --- 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)