We need a backend developer experienced with Apple In-App Purchases (IAP) to implement subscription payment integration for our app. Key Points: -Our environment: Windows server (Node.js) -Client app (iOS) will send Base64 encoded receipts to our backend. -Backend must validate receipts using Apple’s verify Receipt API (Production + Sandbox fallback). -Must handle App-Specific Shared Secret for subscription validation. -Implement webhooks (server-to-server notifications) for subscription renewals/cancellations.
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