Payment Gateway Integration

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PHP

Hi,

I was integrating one bank's Payment Gateway module in one of my client's website. I saw some points which I want to know the reason they occur.

1. When Payment Gateway [Secured] sends RESULT onto some intermediate page [PHP page], I can save all the data to Database, but I can not echo them on the screen.

Why?

2. On the Intermediate page, I use the following code to redirect the user to Success/Failure page according to the result of the transaction.

$redirect = "REDIRECT=http://mysite.com/success.php?paymentID=xxxx";
echo $redirect;    // How this code redirects?

The control comes to various pages as shown below.
Secured Payment Gateway [Response] >> Intermediate.php [Some DB entry according to the response received] >> Success.php

How this redirect works as shown in the code above.