Developer Guide: Handling Apple and Google IAP Notifications Without Data Loss

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A technical guide for mobile developers covers best practices for processing in-app purchase notifications from both Apple App Store and Google Play, emphasizing zero data loss. Apple has introduced new notification types, including RESCIND_CONSENT, tied to U.S. state-level age-verification laws such as Texas's App Store Accountability Act, which took effect January 1, 2026. Google Play routes billing events through Google Cloud Pub/Sub rather than direct webhooks, and now supports additional notification categories like PendingRefundReviewNotification for chargeback disputes requiring developer input. Google has also mandated Play Billing Library version 8 or later for all new apps and updates since August 31, 2026, affecting client-side integrations. The guide highlights common failure points such as incomplete cryptographic verification, lack of idempotency, and flawed account-mapping logic, and recommends platform-provided libraries over manual certificate validation.

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