System Design · Meta · Hard
Assume a free-to-play mobile game monetized through in-app purchases of virtual currency/items and a monthly subscription, with all purchases processed through app-store billing. The measurement path captures client events, server receipt validation events, and app-store financial reports. Report Metrics Define the primary transaction event as payment_settled or receipt_validated, meaning the app-store server confirms the purchase and our backend recognizes it. Core…
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