Credit Card Transaction Hardware devices such as credit card swiping machines requiring dedicated phone lines, have essentially been bumped into obsolescence by the introduction of  PCAuthorize (windows), MacAuthorize (Mac), and IC Verify Software, which now permit credit cards to be processed by computer modem thereby totally eliminating, in most merchant situations, the need for any of the hardware swiping devices to accept credit cards. And, for those merchants with customers at their site, remarkably inexpensive Computer Keyboard Add-On Card Swiping Devices are available to quickly scan and accept credit cards.