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# Subscriptions and offers

Offer customers additional time-based content and services through purchases they make within your app.

## Topics

### Essentials

[Handling Subscriptions Billing](/documentation/StoreKit/handling-subscriptions-billing)

Build logic around the date and time constraints of subscription products, while planning for all scenarios where you control access to content.

[Enabling App Store Server Notifications](/documentation/StoreKit/enabling-app-store-server-notifications)

Configure your server and provide an HTTPS URL to receive notifications about in-app purchase events and unreported external purchase tokens.

[Offering a Subscription Across Multiple Apps](/documentation/StoreKit/offering-a-subscription-across-multiple-apps)

Support a single auto-renewable subscription across multiple apps.

[Reducing Involuntary Subscriber Churn](/documentation/StoreKit/reducing-involuntary-subscriber-churn)

Prevent unintentional loss of subscribers due to billing issues.

### Introductory offers

Provide discount pricing for new customers to encourage them to subscribe.

[Implementing introductory offers in your app](/documentation/StoreKit/implementing-introductory-offers-in-your-app)

Offer introductory pricing for auto-renewable subscriptions to eligible users.

[Testing introductory offers](/documentation/StoreKit/testing-introductory-offers)

Test your introductory pricing in a variety of user scenarios.

[`SKProductDiscount`](/documentation/StoreKit/SKProductDiscount)

The details of an introductory offer or a promotional offer for an auto-renewable subscription.

### Promotional offers

Provide discount pricing for existing or previously subscribed customers to encourage them to renew.

[Setting up promotional offers](/documentation/StoreKit/setting-up-promotional-offers)

Generate a key and configure offers for auto-renewable subscriptions in App Store Connect.

[Implementing promotional offers in your app](/documentation/StoreKit/implementing-promotional-offers-in-your-app)

Offer discounted pricing for auto-renewable subscription products to eligible subscribers.

[Generating a signature for promotional offers](/documentation/StoreKit/generating-a-signature-for-promotional-offers)

Create a signature to validate a promotional offer using your private key.

[Generating a Promotional Offer Signature on the Server](/documentation/StoreKit/generating-a-promotional-offer-signature-on-the-server)

Generate a signature using your private key and lightweight cryptography libraries.

[`SKPaymentDiscount`](/documentation/StoreKit/SKPaymentDiscount)

The signed discount to apply to a payment.

### Offer codes

Provide offer codes to customers to acquire, retain, and win back subscribers.

[Implementing offer codes in your app](/documentation/StoreKit/implementing-offer-codes-in-your-app)

Enable customers to redeem offer codes through the App Store or within an app that uses receipts.

### Subscription service entitlement

[Determining service entitlement on the server](/documentation/StoreKit/determining-service-entitlement-on-the-server)

Identify a customer’s entitlement to your service, offers, and messaging by analyzing a validated receipt and the state of their subscription.


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