[Mission] Coupon Store E-Commerce

🎯 Coupon Store E-Commerce (General · Level 1 · +50 XP)

A checkout workflow allows negative item quantities to reduce order totals and permits unlimited reuse of one-time promotional discount codes.

Learning & Defense Goals:

🎯 Launch Isolated Sandbox on Cyber Lab →

Community Discussion Rules: Discuss methodologies, discovery tactics, and architectural hardening. Please do not post raw flags directly. Share your production remediation code!