我正在整合apple pay。我正在遵循apple pay文档。这是我的代码。

import UIKit
import PassKit

class ApplePayViewController: UIViewController {

@IBOutlet var lblLoading : UILabel!
@IBOutlet var loader : UIActivityIndicatorView!

var totalAmount = "100.0"
let paymentRequest = PKPaymentRequest()
override func viewDidLoad() {
    super.viewDidLoad()
    // Set up the payment request
    paymentRequest.merchantIdentifier = "merchant.com.apple.example"
    paymentRequest.supportedNetworks = [.visa, .masterCard, .amex, .discover]
    paymentRequest.merchantCapabilities = .capability3DS
    paymentRequest.countryCode = "US"
    paymentRequest.currencyCode = "USD"
    
    // Add a payment item
    let item = PKPaymentSummaryItem(label: "Total", amount: NSDecimalNumber(string: totalAmount))
    paymentRequest.paymentSummaryItems = [item]
    
    // Check if the device is capable of making payments
    if PKPaymentAuthorizationViewController.canMakePayments() {
        let authorizationViewController = PKPaymentAuthorizationViewController(paymentRequest: paymentRequest)
        authorizationViewController?.delegate = self
        present(authorizationViewController!, animated: true, completion: nil)
    } else {
        SharedManager.showAlertWithMessage(title: NSLocalizedString("Sorry", comment: ""), alertMessage: "This device is not capable of making payments.", viewController: self)
    }
}}

扩展苹果支付视图控制器：PK支付授权视图控制器委托{

func paymentAuthorizationViewControllerDidFinish(_ controller: PKPaymentAuthorizationViewController) {
    controller.dismiss(animated: true, completion: nil)
}

func paymentAuthorizationViewController(_ controller: PKPaymentAuthorizationViewController, didAuthorizePayment payment: PKPayment, handler completion: @escaping (PKPaymentAuthorizationResult) -> Void) {
    // Verify the payment with your server
    // ...
    
    completion(PKPaymentAuthorizationResult(status: .success, errors: nil))
}}

在didAuthorizePayment委托中，我不知道如何与服务器验证付款。我在文档中找不到任何与此相关的函数或后数据。您能帮助我吗？
谢谢