How I could be sure when I pass a payment in western union to a gold Supplier. That I will receive the merchandise. I don't have any possibility to see his points, if he is a straight person or not?.
Paying with Western Union is only recommended if you can trust the seller and/or the company. As soon as you have made a payment with Western Union, it's almost impossible to get your money back if there are problems with the seller.
Always check a company carefully before doing business with them and try to negotiate safe payment methods, like AliPay.