[pseingatl]

How much is at issue? That's the key. Plus, you're not getting money "back," you simply haven't been paid for services rendered. If the amount is large enough, you can hire a lawyer in Taiwan and sue there. Of course, your client may be bankrupt. You can sell the debt to a Taiwanese debt collection agency. If he has an employer he has a salary and wages that may be subject to garnishment. His employer may have a Code of Conduct and not paying your debts may be a violation of that code. There may be shaming services such as those which exist in Colombia to visit his office and demand payment. A Taiwanese company may want to buy the debt. Does he have assets in the US? You can sue him and levy on those assets. And if you have any proof that the client never intended to pay, you might convince a prosecutor to file charges, and maybe even an Interpol Red Notice. But if it's small amount, take the hit and in the future, demand cash up front. How creative are you?