iOS恢复自动续订订阅

Question

一旦用户打开应用，可以调用restoreCompletedTransactions方法吗？

还是应该在后台线程中排队方法调用？是不是考虑了阻塞线程？

func application(_ application: UIApplication,
                 didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {

    registerForPushNotifications()
    handleRemoteNotifications(launchOptions: launchOptions)
    LoveSubscriptions.store.requestProducts(nil)
    LoveSubscriptions.store.restorePurchases()
    return true
}