Hi,
I contacted Braintree a few months ago and they said that for companies registered in Singapore, Braintree only supports the collection of payments, but NOT the payouts to clients (the payout service is only available for companies regsitered in the U.S.).
I'm not sure whether that service is now coming to Singapore or when, so if you hear anything, would glad to know. Thanks.
(P/S: For Western Union, they do not allow doing it online in Singapore. You have to do it offline at a SingPost shop. And the rate will be at least $25 each time which is not cheaper than telegraphic transfers. Western Union Online is available in several countries, but mainly in North America, Europe, Australia, NZ, but not Singapore).