Why Treating Incentives as Channel Add-Ons Breaks Checkout, and Why Sub-50ms APIs Matter

https://xn--se-wra.com/blog/replace-rigid-coupon-engines-a-step-by-step-guide-for-technical-decision-makers-at-retail-10428

Which core questions about incentive architecture and sub-50ms API response times will I answer? You're building a checkout experience and someone says "just add incentives per channel" while a performance team insists on sub-50ms APIs