macOS app distribution covering code signing (Developer ID, App Store certificates), notarization (notarytool), DMG/pkg creation, App Store submission workflow, sandboxing entitlements, StoreKit for in-app purchases and subscriptions (SubscriptionOfferView, appTransactionID, Transaction.currentEntitlements, subscriptionStatusTask), StoreKit testing with local configuration files, PrivacyInfo.xcprivacy manifest, and dual distribution strategies (App Store + direct). Use when preparing an app for distribution, implementing purchases/subscriptions, configuring signing, or troubleshooting App Store rejection.