TAILIEUCHUNG - HTML cơ bản - p 24

214 Chapter 5: Building Websites Assuming that the amount of data is enough that it makes sense to keep it in a database, where should that database be? Without going into the data security aspects of that question, there are good arguments for keeping data with third-party services, and there are equally good arguments for maintaining a database on your own server. You should not keep customer credit card information unless you absolutely have to. It is a burden of trust. A credit card’s number and expiration date are all that is needed to make some types of purchases. Many online gaming. | 214 Chapter 5 Building Websites Assuming that the amount of data is enough that it makes sense to keep it in a database where should that database be Without going into the data security aspects of that question there are good arguments for keeping data with third-party services and there are equally good arguments for maintaining a database on your own server. You should not keep customer credit card information unless you absolutely have to. It is a burden of trust. A credit card s number and expiration date are all that is needed to make some types of purchases. Many online gaming and adult-content services for example don t even require the cardholder s name. Using a payment service means that you never know the customer s complete credit card number and therefore have much less liability. Dozens of reputable payment services on the Web from to WebMoney work with your bank or merchant services company to accept payments and transfer funds. PayPal which is owned by the online auction firm eBay is one of the easiest systems to set up and is an initial choice for many online business start-ups. A complete customized on-site purchase payment option however should increase sales1 and lower transaction costs. The payment systems a website uses are one of the factors search engines use to rank websites. Before you select a payment system for your website check with your bank to see if it has any restrictions or recommendations. You may be able to get a discount from one of its affiliates. Customer names email addresses and other contact information are another matter. If you choose to use a CMS to power the website it may already be able to manage users or subscribers. If not you can probably find a plugin that will fit your needs. With an email list you can contact people one-on-one. Managing your own email address list can make it easier to integrate direct and online marketing programs. This means that you can set your privacy policy to reflect your .

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