If you see a pending order in the order section your order has not been paid and you can retry payment.
Go into the order detail and click pay order to complete the payment.
If in the order section your order appears red, it is expired and no charge has been issued.
You will see it in red color in the order list but it is NOT to be considered valid and is NOT in any way recoverable, cancellable and cannot be removed from this section.
Your order changes to expired when payment is not completed by the due time frame.