Passkit Agent Skill

PassKit

Accept Apple Pay payments for physical goods, real-world services, donations,

and eligible recurring payments, and add passes to the user's Wallet. Covers

payment buttons, payment requests, authorization, Wallet passes, and merchant

configuration. Targets Swift 6.3 / iOS 26+.

For advanced Apple Pay flows, one PKPaymentRequest can set only one optional

advanced request type: recurring, automatic reload, deferred, Apple Pay Later

availability, or multi-token contexts. Use separate payment requests when a

checkout needs more than one of those modes.

Contents

• Setup
• Displaying the Apple Pay Button
• Creating a Payment Request
• Presenting the Payment Sheet
• Handling Payment Authorization
• Wallet Passes
• Checking Pass Library
• Common Mistakes
• Review Checklist
• References

Setup

Project Configuration

• Enable the Apple Pay capability in Xcode
• Create a Merchant ID in the Apple Developer portal (format: merchant.com.example.app)
• Generate and install a Payment Processing Certificate for your merchant ID
• Add the merchant ID to your entitlements

Availability Check

Always verify the device can make payments before showing Apple Pay UI. If you

check for an active card with canMakePayments(usingNetworks:capabilities:),

Apple's HIG expects Apple Pay to be a primary, prominent payment option wherever

you use that check.

import PassKit

func canMakePayments() -> Bool {
    // Check device supports Apple Pay at all
    guard PKPaymentAuthorizationController.canMakePayments() else {
        return false
    }
    // Check user has cards for the networks you support
    return PKPaymentAuthorizationController.canMakePayments(
        usingNetworks: [.visa, .masterCard, .amex, .discover],
        capabilities: .threeDSecure
    )
}

Displaying the Apple Pay Button

SwiftUI

Use the built-in PayWithApplePayButton view in SwiftUI. Use Apple-provided

button APIs for any control labeled Apple Pay; custom buttons must not include

the Apple Pay logo or "Apple Pay" text.

import SwiftUI
import PassKit

struct CheckoutView: View {
    var body: some View {
        PayWithApplePayButton(.buy) {
            startPayment()
        }
        .payWithApplePayButtonStyle(.black)
        .frame(height: 48)
        .padding()
    }
}

UIKit

Use PKPaymentButton for UIKit-based interfaces.

let button = PKPaymentButton(
    paymentButtonType: .buy,
    paymentButtonStyle: .black
)
button.cornerRadius = 12
button.addTarget(self, action: #selector(startPayment), for: .touchUpInside)

Button types: .plain, .buy, .setUp, .inStore, .donate,

.checkout, .continue, .book, .subscribe, .reload, .addMoney,

.topUp, .order, .rent, .support, .contribute, .tip

Creating a Payment Request

Build a PKPaymentRequest with your merchant details and the items being purchased.

PassKit amount APIs take NSDecimalNumber, not Double.

func createPaymentRequest() -> PKPaymentRequest {
    let request = PKPaymentRequest()
    request.merchantIdentifier = "merchant.com.example.app"
    request.countryCode = "US"
    request.currencyCode = "USD"
    request.supportedNetworks = [.visa, .masterCard, .amex, .discover]
    request.merchantCapabilities = .threeDSecure

    request.paymentSummaryItems = [
        PKPaymentSummaryItem(
            label: "Widget",
            amount: NSDecimalNumber(string: "9.99")
        ),
        PKPaymentSummaryItem(
            label: "Shipping",
            amount: NSDecimalNumber(string: "4.99")
        ),
        PKPaymentSummaryItem(
            label: "My Store",
            amount: NSDecimalNumber(string: "14.98")
        ) // Total
    ]

    return request
}

The last item in paymentSummaryItems is treated as the total and its label

appears in the Pay line on the payment sheet.

Requesting Shipping and Contact Info

Request only the contact fields needed to price, fulfill, or legally process the

order.

Collect required product choices, optional notes, per-item shipping destinations,

and pickup locations before the Apple Pay button when the payment sheet cannot

collect them accurately.

request.requiredShippingContactFields = [.postalAddress, .emailAddress, .name]
request.requiredBillingContactFields = [.postalAddress]

let standard = PKShippingMethod(
    label: "Standard",
    amount: NSDecimalNumber(string: "4.99")
)
standard.identifier = "standard"
standard.detail = "5-7 business days"

let express = PKShippingMethod(
    label: "Express",
    amount: NSDecimalNumber(string: "9.99")
)
express.identifier = "express"
express.detail = "1-2 business days"

request.shippingMethods = [standard, express]

request.shippingType = .shipping // .delivery, .storePickup, .servicePickup

Supported Networks

| Network | Constant |

|---|---|

| Visa | .visa |

| Mastercard | .masterCard |

| American Express | .amex |

| Discover | .discover |

| China UnionPay | .chinaUnionPay |

| JCB | .JCB |

| Maestro | .maestro |

| Electron | .electron |

| Interac | .interac |

Query available networks at runtime with PKPaymentRequest.availableNetworks().

Presenting the Payment Sheet

Use PKPaymentAuthorizationController (works in both SwiftUI and UIKit, no view controller needed). The controller's delegate is weak, so retain the controller for the life of the sheet.

final class CheckoutCoordinator: NSObject {
    private var paymentController: PKPaymentAuthorizationController?

    @MainActor
    func startPayment() {
        let controller = PKPaymentAuthorizationController(
            paymentRequest: createPaymentRequest()
        )
        paymentController = controller
        controller.delegate = self
        controller.present { [weak self] presented in
            if !presented {
                self?.paymentController = nil
            }
        }
    }
}

Handling Payment Authorization

Implement PKPaymentAuthorizationControllerDelegate to process the payment token.

extension CheckoutCoordinator: PKPaymentAuthorizationControllerDelegate {
    func paymentAuthorizationController(
        _ controller: PKPaymentAuthorizationController,
        didAuthorizePayment payment: PKPayment,
        handler completion: @escaping (PKPaymentAuthorizationResult) -> Void
    ) {
        // Send payment.token.paymentData to your payment processor
        Task {
            do {
                try await paymentService.process(payment.token)
                completion(PKPaymentAuthorizationResult(status: .success, errors: nil))
            } catch {
                completion(PKPaymentAuthorizationResult(status: .failure, errors: [error]))
            }
        }
    }

    func paymentAuthorizationControllerDidFinish(
        _ controller: PKPaymentAuthorizationController
    ) {
        controller.dismiss { [weak self] in
            self?.paymentController = nil
        }
    }
}

Handling Shipping Changes

func paymentAuthorizationController(
    _ controller: PKPaymentAuthorizationController,
    didSelectShippingMethod shippingMethod: PKShippingMethod,
    handler completion: @escaping (PKPaymentRequestShippingMethodUpdate) -> Void
) {
    let updatedItems = recalculateItems(with: shippingMethod)
    let update = PKPaymentRequestShippingMethodUpdate(paymentSummaryItems: updatedItems)
    completion(update)
}

Wallet Passes

Adding a Pass to Wallet

Load signed .pkpass data, verify the device can add passes, then present

PKAddPassesViewController when you want the user to review the pass before

adding it. PKPass(data:) expects signed pass data and can throw invalid-data

or invalid-signature errors. Name invalid-data and invalid-signature

failures explicitly instead of hiding them behind a bare try? in review

guidance.

func addPassToWallet(data: Data) {
    guard PKAddPassesViewController.canAddPasses() else {
        return
    }

    do {
        let pass = try PKPass(data: data)
        guard let addController = PKAddPassesViewController(pass: pass) else {
            return
        }
        addController.delegate = self
        present(addController, animated: true)
    } catch {
        // Signed pass data is invalid or the signature cannot be validated.
        showRecoverablePassError(error)
    }
}

SwiftUI Wallet Button

Use AddPassToWalletButton as the SwiftUI equivalent to PKAddPassButton.

import PassKit
import SwiftUI

struct AddPassButton: View {
    let passData: Data
    @State private var addedToWallet = false

    var body: some View {
        if PKAddPassesViewController.canAddPasses(),
           let pass = try? PKPass(data: passData) {
            AddPassToWalletButton([pass]) { added in
                addedToWallet = added
            }
            .addPassToWalletButtonStyle(.blackOutline)
            .frame(width: 250, height: 50)
        }
    }
}

Checking Pass Library

Use PKPassLibrary to inspect and manage passes the user already has. Check

PKPassLibrary.isPassLibraryAvailable() before pass-library operations, but use

PKAddPassesViewController.canAddPasses() to decide whether the device can add

passes. passes() only returns passes your app can access through its

entitlements. When replacing an existing pass, check the Boolean result from

replacePass(with:) and handle failure. For signed pass bundle construction,

update web services, and replacePass(with:), read

references/wallet-passes.md.

let library = PKPassLibrary()

// Check if a specific pass is already in Wallet
let hasPass = library.containsPass(pass)

// Retrieve passes your app can access
let passes = library.passes()

// Check if pass library is available
guard PKPassLibrary.isPassLibraryAvailable() else { return }

Common Mistakes

DON'T: Use StoreKit for physical goods

Apple Pay (PassKit) is for **physical goods, real-world services, donations, and

eligible recurring payments**. StoreKit is for virtual goods, app features, and

digital-content subscriptions. Using the wrong framework leads to App Review

rejection.

DON'T: Hardcode merchant ID in multiple places

// WRONG: Merchant ID scattered across the codebase
let request1 = PKPaymentRequest()
request1.merchantIdentifier = "merchant.com.example.app"
// ...elsewhere:
let request2 = PKPaymentRequest()
request2.merchantIdentifier = "merchant.com.example.app" // easy to get out of sync

// CORRECT: Centralize configuration
enum PaymentConfig {
    static let merchantIdentifier = "merchant.com.example.app"
    static let countryCode = "US"
    static let currencyCode = "USD"
    static let supportedNetworks: [PKPaymentNetwork] = [.visa, .masterCard, .amex]
}

Review Checklist

• [ ] Apple Pay capability enabled and merchant ID configured in Developer portal
• [ ] Payment Processing Certificate generated and installed
• [ ] canMakePayments(usingNetworks:) checked before showing Apple Pay button
• [ ] Apple Pay is prominent wherever active-card availability is checked
• [ ] Product choices, optional details, and complex shipping choices collected before payment sheet
• [ ] Last item in paymentSummaryItems is the total with merchant display name
• [ ] Payment summary and token-context amounts use NSDecimalNumber
• [ ] Payment token sent to server for processing (never decoded client-side)
• [ ] PKPaymentAuthorizationController retained while presented and cleared after finish
• [ ] paymentAuthorizationControllerDidFinish dismisses the controller
• [ ] Shipping method changes recalculate totals via delegate callback
• [ ] StoreKit used for virtual goods/digital content; Apple Pay used for physical goods, services, donations, and eligible recurring payments
• [ ] Wallet passes loaded from signed .pkpass bundles
• [ ] PKPass(data:) invalid-data and invalid-signature failures surfaced
• [ ] PKPassLibrary.isPassLibraryAvailable() used for pass operations, not add-pass capability
• [ ] PKAddPassesViewController.canAddPasses() checked before add-pass UI
• [ ] PKPassLibrary.replacePass(with:) Boolean result checked when replacing a pass
• [ ] Apple Pay button uses system-provided PKPaymentButton or PayWithApplePayButton
• [ ] Add-to-Wallet UI uses system-provided PKAddPassButton, AddPassToWalletButton, or PKAddPassesViewController
• [ ] Error states handled in authorization result (network failures, declined cards)

References

• Extended patterns (recurring/deferred payments, coupon codes, multi-merchant, pass bundles, pass updates): references/wallet-passes.md
• PassKit framework
• PKPaymentRequest
• PKPaymentAuthorizationController
• PKPaymentButton
• PayWithApplePayButton
• AddPassToWalletButton
• PKPass
• PKAddPassesViewController
• PKPassLibrary
• PKPaymentNetwork
• Apple Pay HIG