I started off using this plugin and it worked great as far as processing payments, one of the best that I have ever used. I then decided that I wanted more features such as inventory and sales tracking so I decided to upgrade to the full version that has these features. During the roll over I didn't uninstall the original plugin properly and had self inflicted issues upgrading. I emailed Niaz and within one hour my problems were fixed. I give Niaz a 10/10 on this product and customer support. Thanks again for your support friend.