PayPal Failure

I am testing my checkout using PayPal Sandbox. I created the accounts, got the username and password and the signature, etc. When I click on the PayPal button, I get a failure page. I tried to troubleshoot by adding the Local Checkout Response behavior, but my list of behaviors does not include that one when I select that failure page in Dreamweaver.

The Ecart created two failure pages; pp_checkout_failure.php and checkout_failure.php. The latter page DOES show Local Checkout Response as an option when I click on Add Behavior, but the former does NOT. However, it is the former that comes up when I get the failure page described above, so I can't see what the error is.

How can I add a Local Checkout Response behavior to this page?

Ecart 5
Dreamweaver CS4

add the following code on the checkout_failure.php page to show the full response and the full request:

<?php
if(!session_id()) session_start(); 
echo("PayPal Full Request :<br />");
echo("<code>".isset($_SESSION["PP_DirectPayment_postedValues"])?$_SESSION["PP_DirectPayment_postedValues"]:""."</code><br /><br />");
echo("Paypal Full Response :<br />");
echo("<code>".isset($_SESSION["PP_DirectPayment"])?$_SESSION["PP_DirectPayment"]:""."</code><br /><br />");
?>

I inserted the code as suggested. Now the failure page comes up with:

PayPal Full Request :
Paypal Full Response :

But there is nothing shown after the colons. So I am still in the dark as to what the problem is.

I don't know what caused the problem, but I deleted all of the checkout pages and recreated them and it works fine now.

OK, Glad to hear it is working.