WooCommerce - Send a BCC e-mail order copy when order status changes to completed

wc-bcc-email-order-completed

/* BCC Email for orders completed for WooCommerce version 2.3 and above */
add_filter( 'woocommerce_email_headers', 'es_headers_filter_function', 10, 3);
function es_headers_filter_function( $headers, $id, $object ) {
    if ($id == 'customer_completed_order') {
		$headers .= 'BCC: Trustpilot <[email protected]>' . "\r\n";
    }

    return $headers;
}