When you start selling shareware seriously, you will probably strongly consider gaining the ability to take orders yourself. Before you can do this, however, you need to obtain credit card merchant status. In other words, you need to gain the ability to accept credit cards for payment. Unfortunately, this can be rather tricky to do.
Credit cards are a topic of much confusion and frustration among shareware merchants.
It's not a hopeless battle, but it is one which will cause you some frustration. The main problem is, in short, fraud. There is a lot of credit card fraud. That makes banks and other credit card companies very shy about giving merchant status to small businesses. They're especially shy about giving merchant status to software companies, and extremely reluctant to give it to businesses operated out of the home.