A buying and selling online can be very convenient and rewarding but you always have to protect yourself.
If a deal looks too good to be true, it usually is, If you don't feel secure on a particular site,
leave it and find something else.
At the of online game ,selling ,shopping or either gambling we have also differnet kind of risk ,risk that will really affect to your personal thoughts at negative emotion,,but its normal becuase in a just second/minutes sometimes it will happen to other site to have error ,but if you really believe to smart city eco team,you noticed that the team will be genuis to create this kind of project at very safe to all ages user.