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@ach01 wrote:

   eBay upheld the buyer's claim, isuued a refund, and then demanded my credit card details to reimburse their amount paid, suspending my account pending receipt of same.  . 

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From the OP. If ebay demanded your credit card details post dispute then it is obvious that you had not agreed to the international selling agreement prior to the sale.

Because at the time you agree to that agreement you are also required to redcord a reimbursent method.

(ie ebay would not need to demand your details if you had already agreed because they would have already them)

OP if you have proof of delivery to carrier

then I would  lodge a dispute with the FOS (financial ombusman service) stating that EBAY through paypal has wrongly taken your money.

If you do not have proof of delivery to carrier then  there is not much you can do

You need to quote the Sale of goods act and the deemed delivery to the carrier clause and the international selling agreement requirement to provide a reimbursement method upon signing up.

If ebay requested the money through paypal then  lodge the complaint against your financial services provider not ebay...let paypal fight it out with ebay and let the FOS with your information have it out with paypal.

The original ebay demand ( if you had not signed the international sellers agreement prior) is tantamount to coercion..

 You need to decide yourself whether the moral stand is worth it or not howver I beleive there are avenues for redress