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

https://wiki-fusion.win/index.php/Why_inflexible_coupon_tools_crush_mid-market_and_enterprise_retailers_%E2%80%94_and_what_actually_works

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