derekwong28 - 3:47 am on Jun 18, 2008 (gmt 0)

"Actually I did already ship one item (small value) to this customer few days ago, but this order is over $1000."

I am afraid this is a big red flag. Scammers typically soften a merchant with a small order first followed by a big one. I would suggest that you politely decline it and ask for it to be paid to T/T or escrow.

We have shipped lots of orders to high risk countries like this but only as long as we know that it is issued by a local bank. I suspect that your customers is using a hacked credit from a US or European bank.