How to delete or update Yandex token?

Question

Yandex

I'm trying to update the token like this:

$url = "https://oauth.yandex.ru/authorize?response_type=code&client_id=" . $client_id . "&client_secret=" . $client_secret . "&grant_type=refresh_token&refresh_token=" . $yandex_refresh_token;
header("Location: " . $url);

Removing a token:

$url = "https://oauth.yandex.ru/revoke_token?access_token=".$token."&client_id=" . $client_id . "&client_secret=".$client_secret;
        header("Location: " . $url);

But something doesn't work