PayPal doesn't send me all fields to return url

I've setup subscribe form for PayPal.

...
<input type="hidden" name="return" value="http://mysite.com/success/">
<input type="hidden" name="rm" value="2">
...

Then I make a payment in PP Sandbox and click to "R开发者_运维百科eturn to Merchant" button.

I expect:

all transaction data in $_POST, such txn_type and so on

I get:

[merchantReturn_x] => Return To Merchant
[auth] =>qQJeJB06AAvD3o1Q5_7MOb6oCrg7OLBbQnYJOLBn0x4xAjnRwG4wORijts5Bo5gYPGMAid1eC3R9m9FYDD2
[form_charset] => UTF-8

Whats wrong?

those data will not be posterd to that URL ... search the manual for IPN ( Instant Payment Notification ). Basicly there is another script that receives those parameters.