Passkit

This covers the two main parts of Apple's PassKit framework: accepting Apple Pay payments and adding passes to Wallet. You'll find code for setting up payment buttons in SwiftUI and UIKit, building PKPaymentRequest objects with line items and shipping options, handling the authorization flow with delegates, and presenting the payment sheet. The Wallet side shows how to load .pkpass files and add them with PKAddPassesViewController. It's comprehensive on the payments flow, including how to handle shipping method updates and recalculate totals dynamically. The setup section walks through merchant ID configuration and capability checks, which is helpful since Apple Pay requires specific entitlements and certificates to work. Targets iOS 26+ with Swift 6.3, so it assumes you're on recent tooling.