Code-Snippets-Functions/Execute a function on a child site/WooCommerce/sending-order-notifications-to-the-user-to-billing-email-address.txt

function custom_woocommerce_email_recipient( $recipient, $object, $email ) {
    // Only target "new order" email notifications
    if ( $email->id === 'new_order' ) {
        // Get the user's billing email address
        $billing_email = $object->get_billing_email();
        // Get the user's customer profile email address
        $profile_email = $object->get_user()->user_email;
        // Add the customer profile email address to the recipient list
        $recipient .= ',' . $profile_email;
    }
    return $recipient;
}
add_filter( 'woocommerce_email_recipient', 'custom_woocommerce_email_recipient', 10, 3 );