Send SMS notifications to customers when a customer-facing note is added to an order

woocommerce-twilio-sms-send-customer-notes.php

<?php // only include this if needed

/**
 * Sends an SMS to the customer whenever a new customer note is added to an order.
 *
 * Customer notes usually trigger an email if enabled.
 */
add_action( 'woocommerce_new_customer_note', function( $args ) {

	if ( ! class_exists( 'WC_Twilio_SMS_Notification' ) || empty( $args['order_id'] ) || empty( $args['customer_note'] ) ) {
		return;
	}

	$notification = new \WC_Twilio_SMS_Notification( $args['order_id'] );

	$notification->send_manual_customer_notification( $args['customer_note'] );

} );