# sync() Synchronizes your app’s transaction information and subscription status with information from the App Store. ``` static func sync() async throws ``` ## Discussion Include some mechanism in your app, such as a Restore Purchases button, to let users restore their in-app purchases. In rare cases when a user suspects the app isn’t showing all the transactions, call [`sync()`](/documentation/StoreKit/AppStore/sync()). By calling [`sync()`](/documentation/StoreKit/AppStore/sync()), you force the app to obtain transaction information and subscription status from the App Store. > Important: > Calling ``doc://com.apple.storekit/documentation/StoreKit/AppStore/sync()``displays a system prompt that asks users to authenticate with their App Store credentials. Call this function only in response to an explicit user action, like tapping or clicking a button. In regular operations, there’s no need to call [`sync()`](/documentation/StoreKit/AppStore/sync()). StoreKit automatically keeps up to date transaction information and subscription status available to your app. When users reinstall your app or download it on a new device, the app automatically has all transactions available to it upon initial launch. There’s no need for users to ask your app to restore transactions — your app can immediately get the current entitlements using [`currentEntitlements`](/documentation/StoreKit/Transaction/currentEntitlements) and transaction history using [`all`](/documentation/StoreKit/Transaction/all). For more information about transactions, see [`Transaction`](/documentation/StoreKit/Transaction). --- 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)