What are you talking about?! You are the one at fault - you should refund me first. If you won't refund within 3 days, I will post a negative feedback. Your store will not survive in Japan.
What are you saying? It's your mistake so you pay first, right? If you don't pay within 3 days, I will make you a bad rate. Your shop will fold if it's in Japan.
What the heck are you talking about?! It is your mistake, so the payment should come first! I will give you a poor rating if I do not receive the refund from you within 3 days. Your shop would have already been out of business if it were in Japan.