You are correct in that the seller should not need your email address to give you a refund. In fact, the actual refund/partial refund process is an easy bunch of points and clicks. He clicks on your transaction payment and right there is link to do a refund. You click that, fill in the amount to be refunded, click OK and refund sent and done! Simple, fast and easy! However, there are some sellers that either don't know how to the above refund process or for some reason do not want to and instead will just send you money back. They way you would send money to a friend or to buy something. Thus the request for your email ... although they would have your email address from the originial transaction but if the seller doesn't know how to do an official refund they probably don't know that your email address is already there. Anyways, in the end the result is the same, you get your money back whether he sends it as an official refund or sends it as money to you. The ONLY real difference is an "official refund" all the fees are refunded too but if he just sends you money you get charged fees. Unless he is refunding you some huge amount, the fees are fairly minimal so not a big deal. So in conclusion you have nothing to lose giving the seller your email address BUT I'd suggest you tell him and educate him to the "offical refund" process because it would save him some fee money.
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