According to the U.S. Department of Commerce the estimated total of e-commerce sales for 2005 was $86.3 billion, which is an increase of 24.6 percent over 2004. Overall business successes can sometimes hinge on that business' ability to accept transactions over the internet. In addition, the internet can help turn a local company into an international company and open up new avenues of business.

Once a customer visits an e-commerce websites, adds product to their cart, and then clicks to check out, it official begins the transaction of the sale. Programming in the shopping cart enables the credit card information to be sent to what is called a payment gateway. The payment gateway's sole purpose is to offer a secure way to pass this information through the merchant account and on to the credit card processing bank. The processing bank sends the information to the customer's credit card issuer and the transaction is either approved or declined.