First, you need a Stripe account. Register now.

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:

# Available as a gem
sudo gem install stripe

# If you use bundler, you can add this line to your Gemfile
gem 'stripe'

Client-side

The Stripe iOS SDK is open source, fully documented, and compatible with apps supporting iOS 13 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 create a PaymentIntent.

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 Payment method support for product and payment method support, and our pricing page for fees.

This integration uses three Stripe API objects:

1. 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. (Optional) Customer: To set up a payment method for future payments, you must attach it to a customer. Create an object to represent your customer when they create an account with your business. If your customer makes 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. (Optional) CustomerSession: Information on the object that represents your customer is sensitive, and can’t be retrieved directly from an app. A CustomerSession grants the SDK temporary scoped access to the Customer and provides additional configuration options.

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

1. Retrieves the Customer object or creates a new one.
2. Creates a CustomerSession for the Customer.
3. Creates a PaymentIntent with the amount, currency, and customer.
4. Returns the PaymentIntent’s client secret, the CustomerSession’s client_secret, the Customer ID, and your publishable key to your app.

Set the same Customer on the PaymentIntent that you set on the CustomerSession.

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 (use an existing Customer ID if this is a returning customer)
curl https://api.stripe.com/v1/customers \
  -u sk_test_...: \
  -X "POST" \
  -H "Stripe-Account: {{CONNECTED_ACCOUNT_ID}}"

# Create a CustomerSession for the Customer
curl https://api.stripe.com/v1/customer_sessions \
  -u sk_test_...: \
  -X "POST" \
  -d "customer"="{{CUSTOMER_ID}}" \
  -d "components[mobile_payment_element][enabled]"=true \
  -d "components[mobile_payment_element][features][payment_method_save]"=enabled \
  -d "components[mobile_payment_element][features][payment_method_redisplay]"=enabled \
  -d "components[mobile_payment_element][features][payment_method_remove]"=enabled

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

  -d "automatic_payment_methods[enabled]"=true \

To display the mobile Payment Element on your checkout screen:

• Display the products the customer is purchasing along with the total amount
• Use the Address Element to collect any required shipping information from the customer
• Add a checkout button to display Stripe’s UI

import UIKit
@_spi(CustomerSessionBetaAccess) import StripePaymentSheet

class CheckoutViewController: UIViewController {
  @IBOutlet weak var checkoutButton: UIButton!
  var paymentSheet: PaymentSheet?
  let backendCheckoutUrl = URL(string: "Your backend endpoint/payment-sheet")! // 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, CustomerSession client 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 customerSessionClientSecret = json["customerSessionClientSecret"] 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, customerSessionClientSecret: customerSessionClientSecret)
      // Set `allowsDelayedPaymentMethods` to true if your business handles
      // delayed notification payment methods like US bank accounts.
      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 customer (for example, by displaying an order confirmation screen).

Setting allowsDelayedPaymentMethods to true allows delayed notification payment methods like US bank accounts. For these payment methods, the final payment status isn’t known when the PaymentSheet completes, and instead succeeds or fails later. If you support these types of payment methods, inform the customer their order is confirmed and only fulfill their order (for example, ship their product) when the payment is successful.

The customer might navigate away from 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 and set up your app delegate to forward the URL to the SDK. Stripe doesn’t support universal links.

// This method handles opening custom URL schemes (for example, "your-app://stripe-redirect")
func scene(_ scene: UIScene, openURLContexts URLContexts: Set<UIOpenURLContext>) {
    guard let url = URLContexts.first?.url else {
        return
    }
    let stripeHandled = StripeAPI.handleURLCallback(with: url)
    if (!stripeHandled) {
        // This was not a Stripe url – handle the URL normally as you would
    }
}

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 these other events when collecting payments with the Payment Element:

See Testing for additional information to test your integration.

To enable card scanning support for iOS, set the NSCameraUsageDescription (Privacy - Camera Usage Description) in the Info.plist of your application, and provide a reason for accessing the camera (for example, “To scan cards”).