How to use Apple Pay in iOS

@MainActor
final class WalletViewModel: NSObject, ObservableObject {
    var canMakePayments: Bool {
        PKPaymentAuthorizationViewController.canMakePayments()
    }

    func showApplePay(amount: Amount, from window: UIWindow) {
        let request = PKPaymentRequest()
        request.supportedNetworks = [PKPaymentNetwork.amex, .discover, .masterCard, .visa]
        request.countryCode = "US"
        request.currencyCode = "USD"
        request.merchantIdentifier = "merchant.\(Bundle.main.bundleIdentifier!)"
        request.merchantCapabilities = .capability3DS

        let item = PKPaymentSummaryItem(label: "Add Cash", amount: amount.toNsDecimal)
        request.paymentSummaryItems = [item]

        guard
            let vc = PKPaymentAuthorizationViewController(paymentRequest: request)
        else { return }

        vc.delegate = self
        window.rootViewController?.present(vc, animated: true, completion: nil)
    }
}

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

    func paymentAuthorizationViewController(
        _ controller: PKPaymentAuthorizationViewController,
        didAuthorizePayment payment: PKPayment
    ) async -> PKPaymentAuthorizationResult {
        PKPaymentAuthorizationResult(status: .success, errors: nil)
    }
}