ebay or paypal dont give a fuck. your best method is to refund the customer, after they have paid via eBay checkout then send them an email stating that you made a mistake and refunded them, send them a seperate Paypal bill with no mention of eBay and when they pay (if they pay some ebayers are brainwashed pussies) your funds should not be on hold, transfer the funds into your account ammediately, when it lands switch the funds to another account that feepay or gaybay cant access. Ship the buyer his item's if they don't like it tell them to send it back and if they don't and files a complaint with paypal just send a friendly email to paypal telling them to go fuck thereself or play fair.