Payment module creating 2 orders

[davew]

I have created a payment module based on a combination of paypal and nochex. It's for a french (CiC) payment gateway that uses a predetermined callback to notify my site whenever a card is accepted or declined.

The callback aspect works fine and, just like the paypal module I recreate the session and create the order when the callback indicates a good transaction.

The problem I'm having is that, after completing payment, when the customer clicks on the "return" link that brings them back to checkout_process (same setting as paypal ipn uses) a second order is generated with the same details.

I've tried a number of different things in the before_process() function of my payment module to prevent the second order being created but keep ending up with an empty page if I do that. With nothing in the before_process() function the user is correctly redirected to the checkout_success and given a new number.

I've spent hours scanning the paypal and nochex code for a clue but I can't see anything those modules do that mine isn't doing....

Any ideas... ?

[davew]

Never mind, figured it out in the end - I had a syntax error in the before_process() function, hence the empty page when I returned to it.

In case it helps anyone else, the following clears the basket etc...

function before_process() {
global $order_total_modules;
// referer is added to the return url during the process_button step
if (isset($_GET['referer']) && $_GET['referer'] == 'creditmutuel') {
$_SESSION['cart']->reset(true);
unset($_SESSION['sendto']);
unset($_SESSION['billto']);
unset($_SESSION['shipping']);
unset($_SESSION['payment']);
unset($_SESSION['comments']);
unset($_SESSION['cot_gv']);
$order_total_modules->clear_posts();
zen_redirect(zen_href_link(FILENAME_CHECKOUT_SUCCESS, '', 'SSL'));
} else {
zen_redirect(zen_href_link(FILENAME_CHECKOUT_PAYMENT, '', 'SSL'));
}
}

[infocom]

Hi davew

I am working on a payment module also... I just wondered how did you "recreate the session"?

I just cant get this to work. I have zenid being sent in the callback POST but dont know how to create the session.

Thanks