Complete E-Commerce App in SwiftUI 3, iOS 15 and Apple Pay

Create a new SwiftUI iOS app with a clean folder structure—model, managers, and helpers—set bundle identifier via reverse domain name, and verify on iPhone 13 Pro.

Create a Swift product model conforming to Identifiable with id, name, image, price, and description, plus a static hardcoded product list; data can come from JSON or Firebase.

Create a cart model by defining a card that conforms to Identifiable, with a product and a quantity to track multiple items without duplicates.

Build a SwiftUI product card with image, name, and price, featuring rounded corners and shadow, plus an add-to-cart button and foundations for a card and payment manager.

Learn to build a cart manager in SwiftUI that maintains cart state with an observable object, exposes read-only item count and total, and handles add and remove operations.

Create a product list view using a lazy grid with adaptive columns, integrate a cart manager via environment object, and enable adding items to the cart.

Create a cart view using an environment object cart manager, show an empty cart state or a list of items with a total, and include an Apple Pay payment button.

Build a reusable product row in SwiftUI that shows the item image, name, quantity, and price, and enables deletion via the cart manager with live total updates.

Create a UI image extension that computes the image's average color with Core Image's CIA area average filter and apply it to the product detail's background and text colors.

Build a product detail view in a SwiftUI e-commerce app, wiring in a cart manager, dismiss action, and average color, with add-to-cart functionality and Apple Pay setup anticipation.

Set up a paid Apple developer account, register merchant IDs, generate and install certificates via certificate authority, configure keychain, and enable Apple Pay in your app.

Create a reusable payment handler with the Basket framework and BKPaymentAuthorizationController, using PKPaymentSummaryItem and a zero-dollar PKShippingMethod for Apple Pay processing.

Start payment builds an Apple Pay request with cart items and payment summary items, sets the merchant identifier, and implements the delegate to handle authorization and completion.

Integrate a payment handler into the cart manager and pass items and total for processing. Update the cart view to show Apple Pay on success and reset for an order.

Learn to build and integrate an Apple Pay button in a complete e-commerce app using SwiftUI 3, following Apple's human interface guidelines for button types and styling.