I'm new to eBay and just sold a few things. In one of the auctions, the winner has not paid and it has been over 24 hours. She asked me a bunch of questions before bidding and bid at the last second. I have sent her an invoice and an e-mail inquiring about when I should expect payment, but I have had no response. How long should I wait? or what should I do? Thanks! Any advice would be appreciated.