eBay

I'm a new seller, just sell on ebay for a month. How do you guys handle this case? Buyer put an unusable address, after item was delivered they demand a full refund. he already requested a return, I don't find any option in return center to ask a eba...

I just start selling online for a month and very curious. May I ask, should I ask buyers to leave feedback for my store? If yes, how long after delivery date should I ask the buyer? Thanks in advance.