ios - Sirikit での支払いのセキュリティを強化する

Question

Siri と統合された支払いアプリのセキュリティを強化しようとしています。こちらのリンクからAppleのサンプルコードを使用し、支払いを行う前にTouch ID認証を実装するために以下を調整しました:
(Touch ID認証のための関数「authenticate」を追加し、ハンドル関数で呼び出します)

 func handle(sendPayment intent: INSendPaymentIntent, completion: @escaping (INSendPaymentIntentResponse) -> Void) {
    self.authenticate(successAuth: {

        guard let payee = intent.payee,
            let payeeHandle = payee.personHandle,
            let currencyAmount = intent.currencyAmount,
            let amount = currencyAmount.amount,
            let currencyCode = currencyAmount.currencyCode
            else {
                completion(INSendPaymentIntentResponse(code: .failure, userActivity: nil))
                return
        }

        self.contactLookup.lookup(emailAddress: payeeHandle.value) { contact in
            guard let contact = contact else {
                completion(INSendPaymentIntentResponse(code: .failure, userActivity: nil))
                return
            }

            let payment = Payment(contact: contact, amount: amount, currencyCode: currencyCode)

            self.paymentProvider.send(payment) { success, _, _ in
                guard success else {
                    completion(INSendPaymentIntentResponse(code: .failure, userActivity: nil))
                    return
                }

                let response = INSendPaymentIntentResponse(code: .success, userActivity: nil)
                response.paymentRecord = self.makePaymentRecord(for: intent)

                completion(response)
            }
        }
        }) { (error) in
            print("error in authentication")
            completion(INSendPaymentIntentResponse(code: .failure, userActivity: nil))
            return
    }

}

func authenticate(successAuth: @escaping () -> Void, failure: @escaping (NSError?) -> Void) {
    // 1. Create a authentication context
    let authenticationContext = LAContext()
    var error:NSError?
    guard authenticationContext.canEvaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, error: &error) else {
        failure(error)
        return
    }
    // 3. Check the fingerprint
    authenticationContext.evaluatePolicy(
        .deviceOwnerAuthenticationWithBiometrics,
        localizedReason: "Unlock to send the money",
        reply: { [unowned self] (success, error) -> Void in

            if( success ) {
                successAuth()

            }else {
                let message = self.errorMessageForLAErrorCode(errorCode: (error! as NSError).code)
                print(message)
                failure(error! as NSError)
            }

        })
    successAuth()
}

問題は、Siri が「申し訳ありませんが、アプリで続行する必要があります」と言うことです。