How to add custom email notification in Woocommerce?

As title mentioned, is there any possible way to add email notification just like email to customer on cancelled order. I would like to email to notice on cancelled order due to time limit of pending payment.

Any possible way??

Answer

Here is a custom hooked function in woocommerce_email_recipient_cancelled_order filter hook:

add_filter( 'woocommerce_email_recipient_cancelled_order', 'adding_customer_email_recipient_to_cancelled', 10, 2 );
function adding_customer_email_recipient_to_cancelled( $recipient, $order ){
    if( is_admin() ) return $recipient;

    $billing_email = $order->get_billing_email();
    $recipient .= ', ' . $billing_email; 
}

Code goes in function.php file of your active child theme (or theme) or also in any plugin file.

This code is tested and works on WooCommerce 3.0+