CC Email into WooCommere Customer Invoice Email

wc-customer-invoice-cc.php

function add_cc_to_invoice_email($headers, $email_id, $order) {
    if ($email_id === 'customer_invoice') {
        $cc_email = '[email protected]'; // Replace with the email you want to CC
        $headers .= 'Cc: ' . $cc_email . "\r\n";
    }
    return $headers;
}
add_filter('woocommerce_email_headers', 'add_cc_to_invoice_email', 10, 3);