How to Do WhatsApp Number Screening? From Per-Message Billing Rules, Zombie and Banned Number Removal to Multi-Dimensional Layering

With WhatsApp Business fully shifting to per-delivered-message billing, 24-hour customer service window billing adjustments, and tightened marketing frequency capping (error code 131049), simply checking 'whether registered' no longer meets risk control and cost requirements. This article explains how to establish a high-ROI WhatsApp number screening workflow through local format deduplication, dual-channel registration detection, banned and zombie number removal, and four-dimensional activity and profile layering.