StoreKit 1 deprecation and what else is new for subscription apps at WWDC 2024

WWDC 2024 introduced several updates for subscription apps on the App Store, focusing on easing developers' workflows and enhancing user engagement. Apple has fully deprecated StoreKit 1 APIs, urging developers to transition to StoreKit 2 for in-app purchases. A notable introduction is the win-back offer, allowing developers to re-engage churned subscribers through discounts or free trials, with eligibility criteria based on prior subscription activity. Updates to StoreKit views now allow better customization and clearer paywall displays. App Store Connect improvements include reduced screenshot requirements, new tools for marketing asset creation, and enhanced TestFlight user experiences. Additionally, deep links for custom product pages have been introduced, and App Store search now features personalized suggestions. The App Store Analytics API now offers richer data, and AdAttributionKit aims to enhance ad campaign measurement while preserving user privacy.