Why Sub-50ms API Responses Are Critical for Checkout: Stopping Codebroker Fraud, Single-Use Coupon Leaks, and SMS Abuse

https://www.paste-bookmarks.win/why-sub-50ms-api-responses-matter-for-checkout-and-how-to-build-systems-that-deliver

Checkout drop-off and fraud windows: why milliseconds change whether a sale is saved or stolen When a customer clicks "Pay" during checkout, the system has only a few hundred milliseconds to validate payment, apply discounts, and block abuse