Accept a payment

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Server-side

This integration requires endpoints on your server that talk to the Stripe API. Use our official libraries for access to the Stripe API from your server:

# For detailed setup, see our quickstarts at https://stripe.com/docs/development/quickstart
bundle add stripe
bundle install

Client-side

The Stripe iOS SDK is open source, fully documented, and compatible with apps supporting iOS 11 or above.

View your payment methods settings and enable the payment methods you want to support. You need at least one payment method enabled to complete the next step. Stripe enables card payments by default so you can skip this step if you want to start with cards only. By default, Stripe enables cards and other prevalent payment methods that can help you reach more customers, but we recommend turning on additional payment methods that are relevant for your business and customers. See the Payment method integration options page for information on product and payment method support, and see our pricing page for fees.

This integration uses three Stripe API objects:

1. A PaymentIntent. Stripe uses this to represent your intent to collect payment from a customer, tracking your charge attempts and payment state changes throughout the process.

2. A Customer (optional). To set up a payment method for future payments, it must be attached to a Customer. Create a Customer object when your customer creates an account with your business. If your customer is making a payment as a guest, you can create a Customer object before payment and associate it with your own internal representation of the customer’s account later.

3. A Customer Ephemeral Key (optional). Information on the Customer object is sensitive, and can’t be retrieved directly from an app. An Ephemeral Key grants the SDK temporary access to the Customer.

For security reasons, your app can’t create these objects. Instead, add an endpoint on your server that:

1. Retrieves the Customer, or creates a new one.
2. Creates an Ephemeral Key for the Customer.
3. Creates a PaymentIntent, with the amount, currency, customer, and automatic_payment_methods enabled.
4. Returns the Payment Intent’s client secret, the Ephemeral Key’s secret, the Customer’s id, and your publishable key to your app.

The payment methods shown to customers during the checkout process are also included on the PaymentIntent. You can let Stripe pull payment methods from your Dashboard settings or you can list them manually. Regardless of the option you choose, know that the currency passed in the PaymentIntent filters the payment methods shown to the customer. For example, if you pass eur on the PaymentIntent and have OXXO enabled in the Dashboard, OXXO won’t be shown to the customer because OXXO doesn’t support eur payments.

Unless your integration requires a code-based option for offering payment methods, Stripe recommends the automated option. This is because Stripe evaluates the currency, payment method restrictions, and other parameters to determine the list of supported payment methods. Payment methods that increase conversion and that are most relevant to the currency and customer’s location are prioritized.

# Create a Customer (skip this and get the existing Customer ID if this is a returning customer)
curl https://api.stripe.com/v1/customers \
  -u 
sk_test_4eC39HqLyjWDarjtT1zdp7dc
: \
  -X "POST"

# Create an Ephemeral Key for the Customer
curl https://api.stripe.com/v1/ephemeral_keys \
  -u 
sk_test_4eC39HqLyjWDarjtT1zdp7dc
: \
  -H "Stripe-Version: 2022-08-01" \
  -X "POST" \
  -d "customer"="{{CUSTOMER_ID}}" \

# Create a PaymentIntent
curl https://api.stripe.com/v1/payment_intents \
  -u 
sk_test_4eC39HqLyjWDarjtT1zdp7dc
: \
  -X "POST" \
  -d "customer"="{{CUSTOMER_ID}}" \
  -d "amount"=1099 \
  -d "currency"="eur" \
  -d "automatic_payment_methods[enabled]"=true \

Before displaying the mobile Payment Element, your checkout page should:

• Show the products being purchased and the total amount
• Collect any required shipping information
• Include a checkout button to present Stripe’s UI

import UIKit
import Stripe

class CheckoutViewController: UIViewController {
  @IBOutlet weak var checkoutButton: UIButton!
  var paymentSheet: PaymentSheet?
  let backendCheckoutUrl = URL(string: "Your backend endpoint")! // Your backend endpoint

  override func viewDidLoad() {
    super.viewDidLoad()

    checkoutButton.addTarget(self, action: #selector(didTapCheckoutButton), for: .touchUpInside)
    checkoutButton.isEnabled = false

    // MARK: Fetch the PaymentIntent client secret, Ephemeral Key secret, Customer ID, and publishable key
    var request = URLRequest(url: backendCheckoutUrl)
    request.httpMethod = "POST"
    let task = URLSession.shared.dataTask(with: request, completionHandler: { [weak self] (data, response, error) in
      guard let data = data,
            let json = try? JSONSerialization.jsonObject(with: data, options: []) as? [String : Any],
            let customerId = json["customer"] as? String,
            let customerEphemeralKeySecret = json["ephemeralKey"] as? String,
            let paymentIntentClientSecret = json["paymentIntent"] as? String,
            let publishableKey = json["publishableKey"] as? String,
            let self = self else {
        // Handle error
        return
      }

      STPAPIClient.shared.publishableKey = publishableKey
      // MARK: Create a PaymentSheet instance
      var configuration = PaymentSheet.Configuration()
      configuration.merchantDisplayName = "Example, Inc."
      configuration.customer = .init(id: customerId, ephemeralKeySecret: customerEphemeralKeySecret)
      // Set `allowsDelayedPaymentMethods` to true if your business can handle payment
      // methods that complete payment after a delay, like SEPA Debit and Sofort.
      configuration.allowsDelayedPaymentMethods = true
      self.paymentSheet = PaymentSheet(paymentIntentClientSecret: paymentIntentClientSecret, configuration: configuration)

      DispatchQueue.main.async {
        self.checkoutButton.isEnabled = true
      }
    })
    task.resume()
  }

}

@objc
func didTapCheckoutButton() {
  // MARK: Start the checkout process
  paymentSheet?.present(from: self) { paymentResult in
    // MARK: Handle the payment result
    switch paymentResult {
    case .completed:
      print("Your order is confirmed")
    case .canceled:
      print("Canceled!")
    case .failed(let error):
      print("Payment failed: \(error)")
    }
  }
}

If PaymentSheetResult is .completed, inform the user (for example, by displaying an order confirmation screen).

The customer may go out of your app to authenticate, for example, in Safari or their banking app. To allow them to automatically return to your app after authenticating, configure a custom URL scheme or universal link and set up your app delegate to forward the URL to the SDK.

// This method handles opening custom URL schemes (for example, "your-app://stripe-redirect")
func application(_ app: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey: Any] = [:]) -> Bool {
    let stripeHandled = StripeAPI.handleURLCallback(with: url)
    if (stripeHandled) {
        return true
    } else {
        // This was not a Stripe url – handle the URL normally as you would
    }
    return false
}

// This method handles opening universal link URLs (for example, "https://example.com/stripe_ios_callback")
func application(_ application: UIApplication, continue userActivity: NSUserActivity, restorationHandler: @escaping ([UIUserActivityRestoring]?) -> Void) -> Bool  {
    if userActivity.activityType == NSUserActivityTypeBrowsingWeb {
        if let url = userActivity.webpageURL {
            let stripeHandled = StripeAPI.handleURLCallback(with: url)
            if (stripeHandled) {
                return true
            } else {
                // This was not a Stripe url – handle the URL normally as you would
            }
        }
    }
    return false
}

Additionally, set the returnURL on your PaymentSheet.Configuration object to the URL for your app.

var configuration = PaymentSheet.Configuration()
configuration.returnURL = "your-app://stripe-redirect"

Stripe sends a payment_intent.succeeded event when the payment completes. Use the Dashboard webhook tool or follow the webhook guide to receive these events and run actions, such as sending an order confirmation email to your customer, logging the sale in a database, or starting a shipping workflow.

Listen for these events rather than waiting on a callback from the client. On the client, the customer could close the browser window or quit the app before the callback executes, and malicious clients could manipulate the response. Setting up your integration to listen for asynchronous events is what enables you to accept different types of payment methods with a single integration.

In addition to handling the payment_intent.succeeded event, we recommend handling two other events when collecting payments with the Payment Element:

Use test payment details and the test redirect page to verify your integration. Click the tabs below to view details for each payment method.