Code-Snippets-Functions/Execute a function on a child site/WooCommerce/add-recipient-to-customer-email.txt

add_filter( 'woocommerce_email_recipient_customer_completed_order', 'wc_order_completed_email_add_to', 9999, 3 );
 
function wc_order_completed_email_add_to( $email_recipient, $email_object, $email ) {
   $email_recipient .= ', your@email.com';
   return $email_recipient;
}