Only some customers receive my WhatsApp order messages. What decides who gets one?

Wcart sends to the phone number on the order. Check these on Plugins → WhatsApp Notification:

• No phone on the order: nothing can be sent for that order, so it is skipped.
• Number without a country code: numbers of 10 digits or fewer get the Default Country Code added (91 by default). Set it to your main market, because a foreign number typed without its code goes to the wrong country.
• The number is not on WhatsApp, or Meta rejected the template for that recipient.
• The event toggle is off: each event (Order Placed, Order Shipped and so on) needs its own switch on and a Template name.