Use digital wallets with Issuing

Push provisioning requires a special entitlement from Apple called com.apple.developer.payment-pass-provisioning. You can request it by emailing support-issuing@stripe.com. In your email, include your:

• Card network – Visa or MasterCard.
• Card name – This is the name of the card displayed in the wallet.
• App name – Your app’s name.
• Developer team ID—Found in your Apple Developer account settings under membership (for example, 2A23JCNA5E).
• ADAM ID – Your app’s unique numeric ID. Found in App Store Connect, or in the App Store link to your app (for example, https://apps.apple.com/app/id123456789).
• Bundle ID – Your app’s bundle identifier, also found in App Store Connect (for example, com.example.yourapp).

If you have multiple apps (such as for testing), that have any different fields for the above attributes, you’ll need to request access for each of these.

After we approve and apply your request, your app appears on the details page of a provisioned card in the Wallet app, and the PKSecureElementPass object is available in your app by calling PKPassLibrary().passes(). You might need to remove and re-provision the card for the change to take effect.

Make sure you’ve integrated the latest version of the Stripe iOS SDK with your app.

Determine if the device is eligible to use push provisioning.

1. Check that the value of wallets[apple_pay][eligible] in the issued card is true.
2. Call PKPassLibrary().canAddSecureElementPass(primaryAccountIdentifier:) with the wallets[primary_account_identifier] from your card, and check that the result is true. If the primary_account_identifier is empty, pass an empty string to canAddSecureElementPass().

Retrieve these values on your back end, then pass them to your app for the eligibility check.

import Stripe

class MyViewController: UIViewController {

  @IBOutlet weak var addPassButton: PKAddPassButton!
  // ...
  func handleEligibilityResponse(eligible: Bool, primaryAccountIdentifier: String?) {
    if eligible &&
    PKPassLibrary().canAddSecureElementPass(primaryAccountIdentifier: primaryAccountIdentifier ?? "") {
      addPassButton.isHidden = false
    } else {
      addPassButton.isHidden = true
    }
  }

}

For more context, see the code snippets and references to the sample app at each step. For this step, see how the sample app checks eligibility.

When the user taps the PKAddPassButton, create and present a PKAddPaymentPassViewController, which contains Apple’s UI for the push provisioning flow.

import Stripe

class MyViewController: UIViewController {
  // ...
  func beginPushProvisioning() {
    let config = STPPushProvisioningContext.requestConfiguration(
      withName: "Jenny Rosen", // the cardholder's name
      description: "RocketRides Card", // optional; a description of your card
      last4: "4242", // optional; the last 4 digits of the card
      brand: .visa, // optional; the brand of the card
      primaryAccountIdentifier: self.primaryAccountIdentifier // the primary_account_identifier value from the previous step
    )
    let controller = PKAddPaymentPassViewController(requestConfiguration: config, delegate: self)
    self.present(controller!, animated: true, completion: nil)
  }
}

For more context, see how the sample app uses a PKAddPaymentPassViewController.

The PKAddPaymentPassViewController’s initialiser takes a delegate that you need to implement – typically this can just be the view controller from which you’re presenting it. We provide a class called STPPushProvisioningContext to help you implement these methods.

class MyViewController: UIViewController {
  var pushProvisioningContext: STPPushProvisioningContext? = nil
  // ...
}

extension MyViewController: PKAddPaymentPassViewControllerDelegate {
  func addPaymentPassViewController(_ controller: PKAddPaymentPassViewController, generateRequestWithCertificateChain certificates: [Data], nonce: Data, nonceSignature: Data, completionHandler handler: @escaping (PKAddPaymentPassRequest) -> Void) {
    self.pushProvisioningContext = STPPushProvisioningContext(keyProvider: self)
    // STPPushProvisioningContext implements this delegate method for you, by retrieving encrypted card details from the Stripe API.
    self.pushProvisioningContext?.addPaymentPassViewController(controller, generateRequestWithCertificateChain: certificates, nonce: nonce, nonceSignature: nonceSignature, completionHandler: handler);
  }

  func addPaymentPassViewController(_ controller: PKAddPaymentPassViewController, didFinishAdding pass: PKPaymentPass?, error: Error?) {
    // Depending on if `error` is present, show a success or failure screen.
    self.dismiss(animated: true, completion: nil)
  }
}

For more context, see how the sample app implements PKAddPaymentPassViewControllerDelegate.

You can see that the STPPushProvisioningContext’s initializer expects a keyProvider. This is an instance of a class that implements the STPIssuingCardEphemeralKeyProvider protocol.

This protocol defines a single required method, createIssuingCardKeyWithAPIVersion:completion. To implement this method, make an API call to your backend. Your backend creates an Ephemeral Key object using the Stripe API, and returns it to your app. Your app then calls the provided completion handler with your backend’s API response.

extension MyViewController: STPIssuingCardEphemeralKeyProvider {
    func createIssuingCardKey(withAPIVersion apiVersion: String, completion: @escaping STPJSONResponseCompletionBlock) {
        // This example uses Alamofire for brevity, but you can make the request however you want
        AF.request("https://myapi.com/ephemeral_keys",
                   method: .post,
                   parameters: ["api_version": apiVersion])
        .responseJSON { response in
            switch response.result {
            case .success:
                if let data = response.data {
                    do {
                        let obj = try JSONSerialization.jsonObject(with: data, options: []) as! [AnyHashable: Any]
                        completion(obj, nil)
                    } catch {
                        completion(nil, error)
                    }
                }
            case .failure(let error):
                completion(nil, error)
            }
        }
    }
}

For more context, see how the sample app implements STPIssuingCardEphemeralKeyProvider.

The push provisioning implementation exposes methods that expect you to communicate with your own backend to create a Stripe Ephemeral Key and return a JSON of it to your app. This key is a short-lived API credential that you can use to retrieve the encrypted card details for a single instance of a card object.

To make sure that the object returned by the Stripe API is compatible with the version of the iOS or Android SDK you’re using, the Stripe SDK lets you know what API version it prefers. You must explicitly pass this API version to our API when creating the key.

curl https://api.stripe.com/v1/ephemeral_keys \
  -u 
sk_test_BQokikJOvBiI2HlWgH4olfQ2
: \
  -d "issuing_card"="{{ISSUING_CARD_ID}}" \
  -H "Stripe-Version: {{API_VERSION}}"

{
    "id": "ephkey_1G4V6eEEs6YsaMZ2P1diLWdj",
    "object": "ephemeral_key",
    "associated_objects": [
        {
            "id": "ic_1GWQp6EESaYspYZ9uSEZOcq9",
            "type": "issuing.card"
        }
    ],
    "created": 1586556828,
    "expires": 1586560428,
    "livemode": false,
    "secret": "ek_test_YWNjdF8xRmdlTjZFRHelWWxwWVo5LEtLWFk0amJ2N0JOa0htU1JzEZkd2RpYkpJdnM_00z2ftxCGG"
}

For more context, see how the sample back end creates a Stripe Ephemeral Key.

The com.apple.developer.payment-pass-provisioning entitlement only works with distribution provisioning profiles, meaning even after you obtain it, the only way to test the end-to-end push provisioning flow is by distributing your app with TestFlight or the App Store.

To help with testing, we provide a mock version of PKAddPaymentPassViewController called STPFakeAddPaymentPassViewController that can be used interchangeably during testing.

import Stripe

class MyViewController: UIViewController {
  // ...
  func beginPushProvisioning() {
    let config = STPPushProvisioningContext.requestConfiguration(
      withName: "Jenny Rosen", // the cardholder's name
      description: "RocketRides Card", // optional; a description of your card
      last4: "4242", // optional; the last 4 digits of the card
      brand: .visa // optional; the brand of the card
    )
    let controller = STPFakeAddPaymentPassViewController(requestConfiguration: config, delegate: self)
    self.present(controller!, animated: true, completion: nil)
  }
}