P1-040: Verified rate limiting already integrated in checkout flow
P1-041: Integrated FraudService into checkout and webhook handlers
P1-042: Added coupon code sanitisation in CouponService
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Align commerce module with the monorepo module structure by updating
all namespaces to use the Core\Mod\Commerce convention. This change
supports the recent monorepo separation and ensures consistency with
other modules.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>