WooCommerce failed order email notification

woocommerce-failed-order-email-notification.php

<?php
/**
 * Add a failed order email notification
 */
function sp_failed_order_email_notification( $order_id ) {

	$order     = wc_get_order( $order_id );

	$to        = get_option( 'admin_email' );
	$subject   = 'A order failed, action required';
	$message   = sprintf( __( '%1$s went to the `failed` order status. This may require action to follow up.', 'text-domain' ), '<a class="link" href="' . admin_url( 'post.php?post=' . $order_id . '&action=edit' ). '">' . sprintf( __( 'Order #%s', 'woocommerce'), $order->get_order_number() ) . '</a>' );
	$headers[] = 'From: Me Myself <me@example.net>';
	$headers[] = 'Cc: Some Name <name@email.com>'; // Possible CC
	$headers[] = 'Content-Type: text/html;';
	$headers[] = 'charset=UTF-8';

	wp_mail( $to, $subject, $message, $headers );

}
add_action( 'woocommerce_order_status_failed', 'sp_failed_order_email_notification' );