My wife and I have separate eBay accounts and both use our individual credit cards for payment through PayPal. This week we had a charge of $736.55 show up on both of our credit cards, with an eBay reference. One the same day, we both had credits to our credit card accounts for $736.55. Neither of us bought anything recently that was that high in value, so we don't understand where these are coming from. Is someone trying to fraudulently access our accounts, or is this something that eBay or PayPal does to verify the account?