Payment Page Not Working

It didn’t work

add_filter('wp_head',function(){    
    global $WOOCS;
    if(is_checkout()){        
        $WOOCS->set_currency('TRY');
    }else{
       $WOOCS->set_currency('TRY');
     }
});

Hello,

This option is No though?
wouldn’t we write a special code in functions.php?

Thank you..

https://c2n.me/40LCIPv.png > That option should be no

because it conflicts with another plugin 🙁

Can we find another solution?

Thank you..