WhatsApp broadcast success comes down to three things: proper opt-in, the right template category, and send timing.
Always collect explicit opt-in before adding contacts to a marketing list. A checkbox on your checkout page or a keyword reply ("SEND YES to subscribe") both work — but the consent must be documented.
Use marketing templates only for promotional content. Order updates and OTPs belong in utility or authentication categories. Miscategorising templates is the fastest way to get quality ratings dropped.
Segment your lists and personalise where possible. A broadcast to your entire database on a Monday morning will underperform compared to targeted sends based on purchase history or engagement.