PKPaymentAuthorizationControllerDelegate not being called

I have the below piece of code to do the Apple Pay. For some reason the code DidFinish method in the delegate is never called. Any help is appreciated.

import PassKit

typealias ApplePaymentCompletionHandler = (Bool) -> Void

class ApplePayment: NSObject {
   
    var applePaymentController : PKPaymentAuthorizationController?
    var summaryItems = [PKPaymentSummaryItem]()
    var status = PKPaymentAuthorizationStatus.failure
    var paymentCompletionHandler: ApplePaymentCompletionHandler!
    
    static let networks: [PKPaymentNetwork] = [
        .visa, .masterCard, .discover, .amex
    ]
    
    class func applePayStatus() -> (makePayments: Bool, setupCards: Bool) {
        return (PKPaymentAuthorizationController.canMakePayments(),
                PKPaymentAuthorizationController.canMakePayments(usingNetworks: networks));
    }
    
    func startPayment(completion: @escaping ApplePaymentCompletionHandler, payAmount: String) {
        paymentCompletionHandler = completion
        let amount = PKPaymentSummaryItem(label: "Payment Amount", amount: NSDecimalNumber(string: payAmount), type: .final)
        summaryItems = [amount]
        
        let request = PKPaymentRequest()
        request.paymentSummaryItems = summaryItems
        request.merchantIdentifier = "<MERCHANT_ID>"
        request.merchantCapabilities = .capability3DS
        request.countryCode = "US"
        request.currencyCode = "USD"
        request.supportedNetworks = ApplePayment.networks
        
        applePaymentController = PKPaymentAuthorizationController(paymentRequest: request)
        applePaymentController!.delegate = self
        applePaymentController!.present(completion: { presented in
            if presented {
                print("Apple Payment Controller is presented.")
            }
            else {
                print("Apple Payment Controller is not presented. There is an Issue.")
                self.paymentCompletionHandler(false)
            }
        })
    }
}

extension ApplePayment: PKPaymentAuthorizationControllerDelegate {
    
   
    func paymentAuthorizationController(_ controller: PKPaymentAuthorizationController, didAuthorizePayment payment: PKPayment, handler completion: @escaping (PKPaymentAuthorizationResult) -> Void) {
        self.status = .success
        completion(PKPaymentAuthorizationResult(status: .success, errors: [Error]()))
    }
    
    func paymentAuthorizationControllerDidFinish(_ controller: PKPaymentAuthorizationController) {
        debugPrint("Did Finish.")
        controller.dismiss {
            DispatchQueue.main.async {
                if self.status == .success {
                    self.paymentCompletionHandler(true)
                }
                else {
                    self.paymentCompletionHandler(false)
                }
            }
        }
    }
    
    
}