$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);