didFinishLaunchingWithOptions for watchOS - swift

Question

I am trying to implement push messages in my apple watch app. So I have to use the WKExtensionDelegate. Only problem there is that it seems like there is no "didFinishLaunchingWithOptions" method in it. Is there something equivalent?
This is the code for my AppDelegate
class AppDelegate: NSObject, WKExtensionDelegate {
func applicationDidFinishLaunching() {
print("test function")
registerForPushNotifications()
return
}
func registerForPushNotifications() {
UNUserNotificationCenter.current()
.requestAuthorization(
options: [.alert, .sound, .badge]) { [weak self] granted, _ in
print("Permission granted: \(granted)")
guard granted else { return }
self?.getNotificationSettings()
}
}
func getNotificationSettings() {
UNUserNotificationCenter.current().getNotificationSettings { settings in
print("Notification settings: \(settings)")
guard settings.authorizationStatus == .authorized else { return }
DispatchQueue.main.async {
WKExtension.shared().registerForRemoteNotifications()
}
}
}
func application(
_ application: WKExtension,
didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data
) {
let tokenParts = deviceToken.map { data in String(format: "%02.2hhx", data) }
let token = tokenParts.joined()
print("Device Token: \(token)")
}
func application(
_ application: WKExtension,
didFailToRegisterForRemoteNotificationsWithError error: Error
) {
print("Failed to register: \(error)")
}
}
How do I handle received push Messages?? Thanks in advance