PayPal Express Checkout - Blank Page on Confirm

Greetings --

My site is displaying a blank page when using PayPal Express checkout to process orders. Users click to checkout on paypal, and, when prompted to confirm on our site, they are given a blank page.

I have followed trouble shooting steps found in other threads on this forum. The message that appears on my blank page is "A successful transaction has already been completed for this token." It also appears at the top of the pp_confirm.php page prior to clicking the submit button to complete checkout.

Does anyone know how to fix this issue? I would appreciate any help you can provide.

add the following code to the bottom of the pp_checkout_success page and the checkout_success page, just after the </html> tag:

<?php

// Initialize the session.

// If you are using session_name("something"), don't forget it now!

@session_start();



// Unset all of the session variables.

$_SESSION = array();



// If it's desired to kill the session, also delete the session cookie.

// Note: This will destroy the session, and not just the session data!

if (ini_get("session.use_cookies")) {

    $params = session_get_cookie_params();

    @setcookie(session_name(), '', time() - 42000,

        $params["path"], $params["domain"],

        $params["secure"], $params["httponly"]

    );

}



// Finally, destroy the session.

@session_destroy();

?>

then completely close the browser before testing again.

I added the code to the bottom of the pp_checkout_success page and the checkout_success page as you suggested. I closed the browser and tried again, still with no luck.

The screen routes from paypal express checkout to my confirm page. When I click submit order from the confirm page i just get a blank white page.

Do you know anything else that might work? I never even reach the checkout success pages, so I dont think the code you sent is being triggered....

I have created a support ticket so we can look into this issue further.

To view and edit your support ticket, please log into your support history:
supporthistory.php

If anyone else is experiencing this same issue, please append to this thread.