Overview
Discount Code focuses on a checkout workflow where coupon redemption limits are not enforced correctly.
This lab covers business logic testing rather than a parser or injection bug. The requests may look valid, but the checkout flow still has to enforce pricing rules, limits, and state transitions server-side.
Security Impact
Discount logic flaws can lead to revenue loss, coupon abuse, inconsistent transactions, inventory misuse, and unfair pricing outcomes. These issues often bypass technical filters because each individual request can appear normal.
Vulnerability Scope
Coupon systems, ticket sales, loyalty programs, checkout flows, and subscription upgrades are exposed when counters, balances, or one-time-use rules are not enforced consistently.
Lab Focus
The lab focuses on business rules, server-side enforcement of limits, and why checkout integrity depends on state management as much as input validation.