In-App Purchase

Definition

Why It Matters

In-app purchases are how most consumer apps make money, and the label "In-App Purchases" on a store listing tells users a free download has paid features. For app businesses, the design of IAP products, prices, trials and paywalls has more impact on revenue than almost any feature. Purchase events are also some of the most useful triggers for lifecycle messaging: a first purchase, a renewal, a cancellation or a billing failure each calls for a different message.

How It Works

Developers create products in App Store Connect or the Google Play Console with an ID, price and description. The app shows them, often on a paywall, and starts the purchase through StoreKit or the Play Billing Library. The store handles payment and returns a transaction, which the app or server verifies before unlocking the content. For subscriptions, the store renews automatically and sends server notifications for renewals, cancellations, refunds and billing problems. Many apps use services like RevenueCat, Superwall or Adapty to manage products, paywalls and these events across both stores. Commission rules, and whether apps may link to web checkout, differ by store, program and country.

Example

Best Practices

• 1Verify every transaction on your server before unlocking content
• 2Keep product IDs and prices consistent across iOS and Android where possible
• 3Show prices in local currency from the store, never hardcoded
• 4Send purchase, renewal, cancellation and billing issue events to your lifecycle tools
• 5Offer a clear way to restore purchases on new devices