Add order note after WooCommerce order email sent - Add a private order note when an order email is sent to the customer. https://www.damiencarbery.com/2023/12/add-order-note-when-email-sent-to-customer/

add-order-note-after-email-sent.php

<?php
/*
Plugin Name: Add order note after WooCommerce order email sent
Plugin URI: https://www.damiencarbery.com/2023/12/add-order-note-when-email-sent-to-customer/
Description: Add a private order note when an order email is sent to the customer.
Author: Damien Carbery
Author URI: https://www.damiencarbery.com
Version: 0.1
WC tested to: 8.3.1
*/

defined( 'ABSPATH' ) || exit;


class AddOrderNoteAfterEmailSent {
	// Returns an instance of this class. 
	public static function get_instance() {
		if ( null == self::$instance ) {
			self::$instance = new self;
		} 
		return self::$instance;
	}


	// Initialize the plugin variables.
	public function __construct() {
		$this->init();
	}


	// Set up WordPress specfic actions.
	public function init() {
		// Add hook to run directly after email is sent.
		add_action( 'woocommerce_email_sent', array( $this, 'add_order_note_after_email' ), 10, 3 );
	}


	public function add_order_note_after_email( $wp_mail_return, $email_id, $email_obj ) {
		if ( !is_object( $email_obj ) ) { return; }  // Ensure $email_obj is an object before accessing it.

		// Add the note only for emails sent to the customer.
		if ( $email_obj->is_customer_email() ) {
			$order = new WC_Order( $email_obj->object->get_order_number() );

			// Record whether the email was sent okay.
			// The date/time are not needed as they will both be automatically shown with the note.
			if ( $wp_mail_return ) {
				$order_note = sprintf( '<em>%s</em> email sent.', $email_obj->get_title() );
			}
			else {
				$order_note = sprintf( '<em>%s</em> email NOT sent.', $email_obj->get_title() );
			}
			$order->add_order_note( $order_note );
		}
	}
}
$AddOrderNoteAfterEmailSent = new AddOrderNoteAfterEmailSent();