Lab 14 — SoundMart — Race Condition in Coupon Redemption

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Task: E-commerce store with coupon code system (SOUNDVIP, $500 fixed discount, limited uses). TOCTOU race condition in coupon redemption allows applying coupon beyond usage limit. Solution: Fire 50 concurrent requests via threading.Barrier to stack $5000 discount on $349.99 cart, then checkout triggers fraud detection revealing the flag.