Paypal transaction id

Hello,
I am using paypal as my payment option. I am currently testing payment using sandbox. After completing payment when I return back to my site how can I get transaction id?

And here are the hidden field values that I am passing during checkout...

<input type="hidden" name="cmd" value="_xclick">
<input type="hidden" name="amount" value="<?php echo $amount;?>" />
<input type="hidden" name="currency_code" value="<?php echo $curr_code?>" />
<input type="hidden" name="business" value="al@b.com">
<input type="hidden" name="item_name" value="Test">
<input type="hidden" name="no_shipping" value="1">
<input type="hidden" name="return" value="http://localhost/new/success.php">
<input type="hidden" name="rm" value="2" />

But I am not getting it back in success page when returning from paypal. What I should required in order to get transaction id? Please help me. Thanks in advance...

 

I think theres an option in paypal that let you choose if you want to redirect back your parameters with the transaction account.

 

What integration are you using, IPN, Express, etc...?

 

Hello

Can you paste your php code here so I can guide you accordingly