Ideally, state that their information will not be shared, and abide by this policy. Since users require information at different rates, state how often you will contact them. For example, some people like to keep current on a weekly basis, while for others a month is more than enough. If you do not provide this information, you are bound to disappoint or annoy your visitors. The worst-case scenario is contacting your visitors via email too often.
Payment Make the purchasing process as easy as possible.
Users who have to learn your shopping cart system may think buying from you is not worth the hassle or time required. Some merchants believe that consumers will complete the transaction if they have already decided to buy the product and have invested time entering their information. When accepting credit cards, ensure that transactions are conducted on a secure server, and that customers can learn more about the security if they desire. If credit card customers are redirected through a third party billing system, alert the user that this will occur. Doing so will avoid confusion and suspicion on behalf of the user.