Shopping cart is not being updated once user comes back from payment

Shopping cart is not being updated once user comes back from payment?

Does the code written in the function callback() { does this task?

depends on the payment module. Is this for paypal?

no it is not paypal. It is our customised

can you please point me where is the code for emptying the shopping cart?

in catalog/controller/checkout_process.php index() function is
$this->cart->clear

Hey I'm having an identical problem with my custom Worldpay module, in checkout_process $cart->clear() is called but the products remain in the cart.

Once checkout_process has been called the products from the order remain in cart. Not a huuuge problem, but still not quite right...

thanks

Mike