Apple Pay and Stripe: Token not being sent to Stripe - ios

Question

Set up Apple Pay in my app and it seems to work fine when running on device. Using Stripe as the payment processor but it is not sending the token to Stripe, but seems to be charging the credit card listed in my iPhone's digital wallet.
The problem I am having is that once I press the "Pay with Touch ID", I get a check mark in my Apple Pay sheet but the following page appears in Xcode:
Code for Apple Pay & Stripe
var paymentSucceeded: Bool = false
func paymentAuthorizationViewController(_ controller: PKPaymentAuthorizationViewController,
didAuthorizePayment payment: PKPayment, completion: #escaping (PKPaymentAuthorizationStatus) -> Void) {
STPAPIClient.shared().createToken(with: payment) { (token, error) in
print("I am here")
if error != nil {
completion(.failure)
print("failed")
} else {
self.paymentSucceeded = true
completion(.success)
print("woohoo")
}
self.createBackendCharge(with: token!, completion: completion)
print("created Backend Charge")
self.postStripeToken(token: token!)
print("posted stripe token")
}
} // paymentAuthorizationViewController( didAuthorizePayment )
func createBackendCharge(with token: STPToken, completion: #escaping (_: PKPaymentAuthorizationStatus) -> Void) {
//We are printing Stripe token here, you can charge the Credit Card using this token from your backend.
print("Stripe Token is \(token)")
completion(.success)
} // createBackendCharge func
func paymentAuthorizationViewControllerDidFinish(_ controller: PKPaymentAuthorizationViewController) {
controller.dismiss(animated: true, completion: {
if (self.paymentSucceeded) {
// show a receipt page
}
})
} // paymentAuthorizationViewControllerDidFinish()
#IBAction func applePayPressed(_ sender: UIButton) {
// we have already accepted the request from viewDriverBids
// all that remains is to complete payment
print("enable apple pay")
// send user to Apple Pay to make payment
let paymentNetworks = [PKPaymentNetwork.visa, .masterCard, .interac, .discover, .amex]
if PKPaymentAuthorizationViewController.canMakePayments(usingNetworks: paymentNetworks) {
paymentRequest = PKPaymentRequest()
paymentRequest.currencyCode = "CAD"
paymentRequest.countryCode = "CA"
paymentRequest.merchantIdentifier = "merchant.com.xxx"
paymentRequest.supportedNetworks = paymentNetworks
paymentRequest.merchantCapabilities = .capability3DS
paymentRequest.requiredShippingAddressFields = [.all]
paymentRequest.paymentSummaryItems = self.rydes()
let applePayVC = PKPaymentAuthorizationViewController(paymentRequest: paymentRequest)
applePayVC.delegate = self
self.present(applePayVC, animated: true, completion: {
rRydeHandler.Instance.completeApplePay()
self.paymentComplete = true
self.updateDriverInfoView()
})
} else {
print("Tell the user they need to set up Apple Pay!")
}
} // applePayPressed func ACTION
backend server func
func postStripeToken(token: STPToken) {
let URL = "http://localhost/donate/payment.php"
let params = ["stripeToken": token.tokenId,
"amount": Int(self.driverInfoView.rydeFare.text!)!,
"currency": "cad",
"description": self.riderName] as [String : Any]
let manager = AFHTTPSessionManager()
manager.post(URL, parameters: params, success: { (operation, responseObject) -> Void in
if let response = responseObject as? [String: String] {
let alertController = UIAlertController(title: response["status"], message: response["message"], preferredStyle: .alert)
let defaultAction = UIAlertAction(title: "OK", style: .default, handler: nil)
alertController.addAction(defaultAction)
self.present(alertController, animated: true, completion: nil)
}
}) { (operation, error) -> Void in
self.handleError(error as NSError)
print(error)
}
}
How can I resolve this issue?

Answer 1

Enable exception breakpoints then Xcode should crash on the line that is causing the issue.
It is almost certainly caused by one of the ! in your code.
Force unwrapping values is very dangerous. It's always better and safer to unwrap it in a guard let or if let.