Stripe

I added Stripe to my app so that I can use Apple Pay. One problem that I am having is that I already have a view controller that shows the user the price. What I want to do is make so that when the Apple Pay pop up shows it shows the price of the price view controller. This is the code that I currently have:

import UIKit
import Stripe
import CoreLocation

class massagePriceView: UIViewController, PKPaymentAuthorizationViewControllerDelegate{
    var price : Float?
    var category : MassageType?
    var length: massageLength?
    var dateOfMassage: Date?
    var physicalAddress : String = ""
    fileprivate var currentLocation : CLLocation?
    fileprivate let locationManager = CLLocationManager()
    
    @IBOutlet weak var massageTypePrice: UILabel!
    @IBOutlet weak var massageLengthPrice: UILabel!
    @IBOutlet weak var massageScheduledTime: UILabel!
    @IBOutlet weak var massagePriceTotal: UILabel!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        print("viewDidLoad starts")
        if price != nil { massagePriceTotal.text = String(format: "$" + "%.2f", price!) }
        print("price is", massagePriceTotal.text!, price!)
        if category != nil {massageTypePrice.text = category!.description() }
        print("category is", massageTypePrice.text!, category!.description())
        if length != nil { massageLengthPrice.text = length!.description() }
        print("length is", massageLengthPrice.text!, length!.description())
        if dateOfMassage != nil {
            let formatter = DateFormatter()
            formatter.dateFormat = "MM/dd/yyyy hh:mm a"
            massageScheduledTime.text = formatter.string(from: dateOfMassage!)
        }
        
        addApplePayPaymentButtonToView()
    }
    
    private func addApplePayPaymentButtonToView() {
        let paymentButton = PKPaymentButton(paymentButtonType: .buy, paymentButtonStyle: .black)
        paymentButton.translatesAutoresizingMaskIntoConstraints = false
        paymentButton.addTarget(self, action: #selector(applePayButtonTapped(sender:)), for: .touchUpInside)
        view.addSubview(paymentButton)
        
        view.addConstraint(NSLayoutConstraint(item: paymentButton, attribute: .centerX, relatedBy: .equal, toItem: view, attribute: .centerX, multiplier: 1, constant: 0))
        view.addConstraint(NSLayoutConstraint(item: paymentButton, attribute: .bottom, relatedBy: .equal, toItem: view, attribute: .bottom, multiplier: 1, constant: -25))
    }
    
    @objc private func applePayButtonTapped(sender: UIButton) {
        // Cards that should be accepted
        let paymentNetworks:[PKPaymentNetwork] = [.discover, .amex, .masterCard, .visa]
        
        if PKPaymentAuthorizationViewController.canMakePayments(usingNetworks: paymentNetworks) {
            let request = PKPaymentRequest()
            
            request.merchantIdentifier = "merchant.com.shiningdevelopers"
            request.countryCode = "CA"
            request.currencyCode = "CAD"
            request.supportedNetworks = paymentNetworks
            request.requiredShippingContactFields = [.name, .postalAddress]
            // This is based on using Stripe
            request.merchantCapabilities = .capability3DS
            
            let massage = PKPaymentSummaryItem(label: "Massage", amount: NSDecimalNumber(decimal: 1.00), type: .final)
            let tax = PKPaymentSummaryItem(label: "Tax", amount: NSDecimalNumber(decimal:1.00), type: .final)
            let total = PKPaymentSummaryItem(label: "Total", amount: NSDecimalNumber(decimal:3.00), type: .final)
            request.paymentSummaryItems = [massage, tax, total]
            
            let authorizationViewController = PKPaymentAuthorizationViewController(paymentRequest: request)
            
            if let viewController = authorizationViewController {
                viewController.delegate = self
                
                present(viewController, animated: true, completion: nil)
            }
        }
    }
    
    func paymentAuthorizationViewController(_ controller: PKPaymentAuthorizationViewController, didAuthorizePayment payment: PKPayment, handler completion: @escaping (PKPaymentAuthorizationResult) -> Void) {
        // Let the Operating System know that the payment was accepted successfully
        completion(PKPaymentAuthorizationResult(status: .success, errors: nil))
    }
    
    func paymentAuthorizationViewControllerDidFinish(_ controller: PKPaymentAuthorizationViewController) {
        // Dismiss the Apple Pay UI
        dismiss(animated: true, completion: nil)
    }
    
    @IBAction func massagePriceViewBackButton(_ sender: Any) {
        dismiss(animated: true, completion: nil)
    }
}