Discount not removed on failed order

Hi Claudio,

I’ve applied a 5% discount for users paying with credit card (with your plugin).
This is the scenario:
1. The user goes through the checkout process and places an order (all works fine here).
2. The user is redirected to the shop owners bank (not PayPal) to pay with their credit card.
3. Credit card is denied for insufficient funds.
4. The user is redirected to their account where they can try and pay again for the order
5. User clicks pay for order.
6. In the checkout process the order already has the 5% discount, even if they choose a different payment method.

So basically the discount is saved to the order and not the payment gateway.

Am i missing something?
Thanks,
Jonathan.