How a TypeScript Webhook Bug Can Double-Credit Users on Duplicate Payments

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A TypeScript lab demonstration reveals how a flawed webhook handler can grant application credit twice when the same payment event is delivered more than once. In the broken implementation, replaying a single $19 payment event results in $38 of credit being issued, even though no second payment occurred. The fix involves wrapping both the event marker insert and the credit grant inside a single SQLite transaction, ensuring both actions succeed or fail together. A unique key on the processed-events table prevents duplicate claims by detecting already-handled event IDs. The lab includes 10 tests covering scenarios such as concurrent processes, failure injection, and connection restarts, and runs on Node.js 24.18 or newer.

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