How to correctly make a request to the Yandex api for the BlockedIps method?

Question

PHP

I get a token, I get user data...
But I can't block ip through the BlockedIps method - it gives an error "This method does not exist".
The code:

$data = array("token" => "токен пользователя","method" => "add", "params"=>"BlockedIps", "Items"=>"145.255.8.192");                                                                    
$data_string = json_encode($data);                                                                                   
                                                                                                                     
$ch = curl_init('https://api.direct.yandex.ru/v4/json/');                                                                      
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");                                                                     
curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);                                                                  
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);                                                                      
curl_setopt($ch, CURLOPT_HTTPHEADER, array(                                                                          
    'Content-Type: application/json',                                                                                
    'Content-Length: ' . strlen($data_string))                                                                       
);                                                                                                                   
                                                                                                                     
$result = curl_exec($ch);
  
  var_dump($result);

I am doing according to the documentation:
https://tech.yandex.ru/direct/doc/ref-v5/campaigns...
Please help!