so, you are paying via western union? there is a chance that this would be a scam, think of it this way. with WU, you pay the store, i collect it and disappear - you cannot track me of recall funds etc... or even recall the money or legal proceedings.
whereas with paypal, it is different, as long as you secure it properly.
e.g.
1) only give him the account information or complete account information such as the last name only AFTER the paypal funds have been successfully placed in your bank.
2) verify the buyer's paypal account, get them to fax ID, verify address etc...
3) REQUEST the paypal money from them, place something along the lines of "my paying you WAIVE your buyer projections and you acknowledge that you have RECEIVE the item (VIRTUAL ITEM).
4) get them to show that it is their paypal account by getting them to email you using a ISP email (take down the IP address from the header) at match it to their paypal email - that way, you can forward the email to paypal dispute to prove that it was not a stolen paypal account.
5) finally, get them to open and close a dispute regarding your issue so they cannot file another.
then again, i am a paypal newb, so, maybe you could ask more experience members such as KCJ, SWEETDEALSMD etc... for help securing paypal funds etc...
good luck.
-Bones