When it comes to creating a successful mobile app, one of the key features that can set you apart from the competition is the ability to offer in-app purchases. In this Xcode tutorial, we will walk you through the process of setting up and configuring consumable in-app purchases using Xcode 12.

To get started, make sure you have a Sandbox Apple ID set up on your device. You can do this by opening the App Store app, going to Settings, and clicking the Sign In button to sign in with your Sandbox Apple ID. This will allow you to test your in-app purchase functionality without actually making any purchases.

Once you have your Sandbox Apple ID set up, you can start creating your in-app purchase products. In this example, we'll be focusing on non-consumable IAPs, which are products that once purchased cannot be purchased again.

To create a non-consumable IAP, go to the Capabilities tab in Xcode and toggle on In-App Purchases. This will allow you to configure your IAP products using the StoreKit API.

Next, we'll need to create a product identifier for our IAP. This can be done by going to the Product IDs section of the App Store Connect portal and clicking the 'Create New' button. Fill in the required information, including the name and description of your product, as well as any relevant screenshots or videos.

Once you have created your product identifier, you'll need to configure it in Xcode. To do this, go to the Capabilities tab and toggle on In-App Purchases. Then, select the 'Product IDs' option from the drop-down menu and enter the product identifier you just created.

With your product identifier configured, you can now implement the IAP functionality in your app using the StoreKit API. This involves creating a SKPaymentTransactionObserver instance and implementing the required delegate methods to handle transactions.

In this example, we'll be focusing on the simplest possible implementation of an IAP, which is to purchase a non-consumable product and then display a success message to the user.

To do this, create a new Swift file in your Xcode project and add the following code:

```swift

import StoreKit

class InAppPurchaseViewController: UIViewController {

let paymentQueue = SKPaymentQueue.default()

override func viewDidLoad() {

super.viewDidLoad()

// Create a product identifier for our IAP

let productID = 'com.example.myapp.nonconsumable.product'

// Create a payment request with the product identifier

let paymentRequest = SKPaymentRequest(product: SKProduct(productID: productID))

// Add the payment request to the payment queue

paymentQueue.add(paymentRequest)

}

// Handle transaction updates

func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: 'SKPaymentTransaction') {

for transaction in transactions {

switch transaction.transactionState {

case .purchased:

// Display a success message to the user

print('Purchased!')

// Remove the transaction from the queue

paymentQueue.finishTransaction(transaction)

default:

break

}

```

That's it for this Xcode tutorial on in-app purchases. We've covered how to set up and configure non-consumable IAPs using Xcode 12, as well as how to implement the IAP functionality in your app using the StoreKit API.

In the next part of this series, we'll be covering how to handle errors and troubleshoot issues with your in-app purchases. We'll also be looking at how to use AssetBundles to deliver downloadable content to your users.

Remember, implementing in-app purchases is just one part of creating a successful mobile app. Make sure you're also focusing on providing a great user experience and delivering high-quality content to keep your users engaged.

Xcode tutorial in app purchase