A practical guide to handling App Store Server Notifications using StoreKit 2 and an ExpressJS backend. Covers the multi-layer JWT decoding process Apple uses for signedPayload, signedTransactionInfo, and signedRenewalInfo. Walks through building a lightweight Express endpoint that receives notifications, decodes nested signed payloads, extracts transaction and renewal details, and forwards production events to Slack. Also covers local development with ngrok, environment filtering, and key notification fields like notificationType, subtype, and originalTransactionId.
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