According to a few estimates, the number of online shoppers in the United States is expected to swell from 137 million in 2010 to 175 million in 2016. In the world of online credit card processing, there is very little room for error. Small and medium sized businesses that want to be able to accept payments online from across the world should make sure they never have to second guess the payment processing services provider they pair up with. Payment processing services are designed for convenience. Through online payment systems, customers can be billed via email, which can end up…