WPNotif – WordPress SMS & WhatsApp Notifications is a plugin that lets you send notifications through SMS or WhatsApp directly from your WordPress site. It integrates nicely with WooCommerce so that users get alerts when orders are placed or their status changes.

You can also send manual SMS/WhatsApp messages, use different gateways depending on country, and set up templates in multiple languages. It supports features like automatic order-status update notifications, multisite setups, GDPR compliance, and country-code detection for phone numbers.