NameBucks received. Thanks.
On topic here, I would suggest that if you have not heard from the buyer (or seller) in a couple of hours, send a friendly PM with a summary of the exchange and payment information. The automated software exchange does not always work as smoothly as expected and may need a little helping hand from a human!
Sending a summary of purchase details also can help jog the human memory and save the buyer from trying to track down information which may be no longer easily accessible. For new members especially, this could save a whole lot of misunderstanding.