stpaddcardviewcontroller
    func handleAddPaymentOptionButtonTapped() {
        // Setup add card view controller
        let paymentConfiguration = STPPaymentConfiguration()
        paymentConfiguration.requiredBillingAddressFields = .full
        paymentConfiguration.publishableKey = "redacted"
        let theme = STPTheme()
        
        let addCardViewController = STPAddCardViewController(configuration: paymentConfiguration, theme: theme)
        addCardViewController.delegate = self
        
        // Present add card view controller
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        let navigationController = UINavigationController(rootViewController: addCardViewController)
        present(navigationController, animated: true)
    }  


	 var cardParams = STPPaymentMethodCardParams()
    let billingDetails = STPPaymentMethodBillingDetails()
    
    func addCardViewController(_ addCardViewController: STPAddCardViewController, didCreateToken token: STPToken, completion: @escaping STPErrorBlock) {
        cardParams.token = token.tokenId
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        dismiss(animated: true)
    }    

var clientSecret: String?
    func createPaymentIntent() {
        let paymentAmount = 1000
        let paymentMethodTypes = ["card"]
        MyAPIClient.sharedClient.createPaymentIntent(amount: paymentAmount) { (clientSecret) in
            self.clientSecret = clientSecret
        }
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    }
    
    func confirmPaymentIntent() {
        if let clientSecret = clientSecret {
            let paymentMethodParams = STPPaymentMethodParams(card: cardParams, billingDetails: nil, metadata: nil)
            let paymentIntentParams = STPPaymentIntentParams(clientSecret: clientSecret)
            paymentIntentParams.paymentMethodParams = paymentMethodParams
            
            let amount = 1000
            MyAPIClient.sharedClient.createAndConfirmPaymentIntent(paymentIntentParams, paymentMethodParams: paymentMethodParams, amount: amount) { (paymentIntent, err) in
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                print(err)
            }
        }
    }



///////////////// MyApiClient

    func createPaymentIntent(amount: Int, completion: @escaping (_ clientSecret: String) -> ()) {
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        let url = "https://us-central1-foodfactory-813ab.cloudfunctions.net/createStripePaymentIntent"
        let params: [String: Any] = [
            "amount": amount,
            "currency": "USD",
            "payment_method_types": ["card"]
        ]
        Alamofire.request(url, method: .post, parameters: params)
            .validate(statusCode: 200..<300)
            .responseJSON { responseJSON in
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                if let json = responseJSON.result.value as? [String: Any] {
                    if let clientSecret = json["client_secret"] as? String {
                        completion(clientSecret)
                    }
                }
        }
    }


    func createAndConfirmPaymentIntent(_ paymentIntentParams: STPPaymentIntentParams,
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                                       paymentMethodParams: STPPaymentMethodParams,
                                       amount: Int,
                                       completion: @escaping STPPaymentIntentCompletionBlock) {
        

        let url = "https://us-central1-foodfactory-813ab.cloudfunctions.net/confirm_payment"
        guard let piCheck: String = paymentIntentParams.stripeId else {return}
        
        var params: [String: Any] = [
            "payment_intent_id": paymentIntentParams,
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            "amount": amount,
            "currency": "gbp",
            "confirm": true,
        ]
        //        params["shipping"] = STPAddress.shippingInfoForCharge(with: shippingAddress, shippingMethod: shippingMethod)
        Alamofire.request(url, method: .post, parameters: params)
            .validate(statusCode: 200..<300)
            .responseJSON(completionHandler: { (response) in
                switch response.result {
                case .success(let json):
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                    completion(STPPaymentIntent.decodedObject(fromAPIResponse: json as? [AnyHashable: Any]), nil)
                case .failure(let error):
                    completion(nil, error)
                }
            })
    }
stpaddcardviewcontroller