Resend WooCommerce New Order Notification On Processing

wcnonop.php

/*
 * @snippet       Resend WooCommerce new order notification to admin when order status changes to processing 
 * @author        https://gist.github.com/Acephalia
 * @caffeinate    https://buymeacoffee.com/acephaliax
 */

// Allow resending of New Order emails
add_filter('woocommerce_new_order_email_allows_resend', '__return_true');

// Resend New Order notification when order status changes to processing
add_action('woocommerce_order_status_processing', 'resend_new_order_notification_to_admins', 10, 1);

function resend_new_order_notification_to_admins($order_id) {
    if (!$order_id) {
        return;
    }

    // Get the WC_Email_New_Order object
    $email_new_order = WC()->mailer()->get_emails()['WC_Email_New_Order'];

    // Send the New Order email notification for the $order_id
    $email_new_order->trigger($order_id);
}