Currently I was working on a simple Paypal payment system, which let our site user to buy credits via paypal and then redirected to our site again to confirm the deal. It was very simple and there was no problem at all when I was just trying with a single testing payment. However, the problem [...]

Now most people who used internet a lot are quite familiar with different SNS sites such as Facebook, Kaixin, Twitter and etc… One of the similarities of those sites is that they boom like mushrooms( or virus…).  The way that they are spread is so smart that they do not need to put too much [...]