Resubmit Payment after PayPal Failure

This scenario occurred during testing the shopping cart in Joomla 2.5.9 using latest version of Hikashop. The payment processor was set to payPal Sandbox - but it occurs to me (and the tester concerned) that this could happen also on live PayPal payments.

Here are the conditions:

1. Create an order and proceed to PayPal to pay.
2. Owner of the Sandbox not logged in to the developer account
3. (note that the new beta appears to require the owner to use LIVE PayPal credentials - although this may be a problem using a legacy sandbox account. Irrespective, the point is that the main account holder has not logged in)
4. Tester/User is presented with the developer account screen and if he/she does not have the developer credentials the transaction can go no further.
5. The Tester/User returns to the website to find:

• the cart is empty
• the order is at created status

[/ol]
The question raised by the tester:

• How can this order be paid?
• There appears to be no resubmit button or try again option. The tester/user can see the order in "My Orders" but there is only the single option to cancel.

If a real PayPal transaction failed (network interruption, user goes to answer the door and the PayPal option time out, etc...) how would the user resubmit?

Thanks,
Ric