I recently sold a Coach bag on eBay but when I went to the invoice I was shorted by $5 because of some kind of discount that I did not offer. The buyer stated that she does not know where this discount came from but she brought several bags and she got the same discount on all of them. She requested that I send her an invoice for the additioanal $5 which is what I did but I have not received it yet. The auction ended on Tuesday and I request full payment within 48hours. Should I not worry about the money and just send her the bag or wait for the rest of the money? I send her a reminder today via paypal. I am new to selling ahd would really appreciate your expert advice.