How to avoid scam when doing international cross-border online shopping?

In this globalization era, cross border shopping through Internet becomes more and more popular. Internet makes the world flat which means consumers can easily meet good sellers and cheaters very easily at the same time.

To avoid buying from scam website and sellers, people must remember some typical characteristics of them as following:
1)They often have no address, no phone number in their website. The only contact method is by email or web page.
2)They often sell brand name products, especially big name clothes,shoes,electronics etc which have a lot of potential buyers.
3)They often sell at very very low price including shipping cost.
4)They often require Western Union payment or wire transfer or any other payment which can not be charged back.
5)They often have no review system or has a review system which can be easily cooked by sellers.
REMEMBER TO STAY ALWAY FROM SHOPPING WEBSITE WHICH MEET TWO OR MORE POINTS OF ABOVE STANDARDS.

A good reliable online marketplace must have following feature:
1)Their payment system normally support credit card,paypal, alipay etc which can be charged back when scam is detected or reported within buyer protection deadline.
2)They have buyer protection system which allow buyer to open dispute against seller when goods is lost or damage during shipment, when goods does not arrive after deadline or goods is not as described as the advertisement.
3)Seller should be responsible to buy insurance for the shipment lost and damage risk.
4)They have a good review or feedback system which can not be cooked by seller.
If you don’t know which website is good, simply buy from ebay/aliexpress/amazon/wish . These four websites have been test by many international cross border buyers and 100% meet above four standards.