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Auth bypasses, SSRF, IDOR, secret leaks, prompt-injection surfaces — across your real call-graph, not just the diff.
Idempotency gaps, missing transactions, race conditions, schema drift, double-write hazards.
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Race condition on line 87. Two webhook deliveries within the Stripe retry window will both call handleRefund() before the row lock is acquired.
Suggested fix: wrap with withIdempotency() as in billing/charges.ts:142. Will reduce double-refund risk to < 0.01%.
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