Debugging empty cart function in payment plugin

[dzséti]

I have developed a credit card payment plugin for payments with Budapest Bank (GE Money) for use with VM 2.0 . I started from the paypal plugin, simplified and incorporated the bank's requirements.

It appears to work ok - the bank has even tested it - as far as returning to the correct url page depending on failure or success, and changing the order status (for example to cancelled if payment failure)

But one thing I cannot solve is to get the cart emptied - no errors even at maximum reporting level - but no cart emptying either.

My latest (not working) attempt is to add to function plgVmOnPaymentNotification():

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$cart = VirtueMartCart::getCart();
$cart->emptyCart();

Even help with debugging would assist ... putting print_r() or dump() inside the plugin doesnt help!

I am sure that the code is being reached because it is just before the code to change the order status and set the return url (which work) but still no result 

(the paypal plugin is more complex than mine in that it empties the cart based on the session id and order number - I have tried a version of this too but without success)