LU — only mandatory parameters

<form name="live_update" method="POST" action="https://secure.payu.ru/order/lu.php" target="_blank">
<input name="MERCHANT" type="hidden" value="demo2" id="MERCHANT">
<input name="ORDER_REF" type="hidden" value="5441049" id="ORDER_REF">
<input name="ORDER_DATE" type="hidden" value="2014-07-07" id="ORDER_DATE">
<input name="ORDER_PNAME[]" type="hidden" value="Тестовый товар" id="ORDER_PNAME0">
<input name="ORDER_PNAME[]" type="hidden" value="Второй тестовый товар" id="ORDER_PNAME1">
<input name="ORDER_PCODE[]" type="hidden" value="123" id="ORDER_PCODE0">
<input name="ORDER_PCODE[]" type="hidden" value="321" id="ORDER_PCODE1">
<input name="ORDER_PRICE[]" type="hidden" value="2" id="ORDER_PRICE0">
<input name="ORDER_PRICE[]" type="hidden" value="1" id="ORDER_PRICE1">
<input name="ORDER_QTY[]" type="hidden" value="1" id="ORDER_QTY0">
<input name="ORDER_QTY[]" type="hidden" value="1" id="ORDER_QTY1">
<input name="ORDER_VAT[]" type="hidden" value="0" id="ORDER_VAT0">
<input name="ORDER_VAT[]" type="hidden" value="0" id="ORDER_VAT1">
<input name="PRICES_CURRENCY" type="hidden" value="RUB" id="PRICES_CURRENCY">
<input name="ORDER_HASH" type="hidden" value="cc6e158d7a4a8f9956794f6300929326" id="ORDER_HASH">
<input name="BILL_FNAME" type="hidden" value="Тетовый" id="BILL_FNAME">
<input name="BILL_LNAME" type="hidden" value="плательщик" id="BILL_LNAME">
<input name="BILL_BANKACCOUNT" type="hidden" value="" id="BILL_BANKACCOUNT">
<input name="BILL_EMAIL" type="hidden" value="test@test.ru" id="BILL_EMAIL">
<input name="BILL_PHONE" type="hidden" value="79101234567" id="BILL_PHONE">
<input name="LANGUAGE" type="hidden" value="en" id="LANGUAGE">
<input type="submit" name="submit" value="Отправить">
</form>