I recently sold an item. I sent the buyer and invoice, They paid it, Then messaged me back right away saying "this is my address" Which didn't match their paypal shipping address. I have three questions: 1) Can the buyer update their address so it will show the correct one before I ship it. 2) if not, Do i have to give them a refund and then another invoice so the address appears correct? 3)If i send a refund am i charged the 3% paypal seller fees?