They will either pay or they wont,and you have to wait 4 days to find out,and ebay will send them a payment reminder in the meantime.
If they dont pay you report non payment and complete the case before offering 2nd chance offers or relisting,otherwise you face reports of seller non performance,and neg feedback.No point in offering cancellation of the transaction as they likely wont agree.
Its early days and not all buyers pay immediately.
You have the option of adding them to your blocked bidder list in the meantime
