For those providers who are using the unencrypted MagTek card swipers (small, black rectangular devices), these act as keyboard emulators. Since this is the case you will be able to plug these into your computer and then it will automatically install a driver. After this you are ready to start taking payments.
In order to use these, first go through the payment flow as you would normally. However once you reach the payment information page, click into the card number field.
Then after this go ahead and swipe the card through the device. At this point it will start to fill all the fields with the associated data from the magnetic stripe. The payment will be taken without having to select Submit.
Please note: Some fields may be left blank but this is okay. The reason that they may be left blank is that the data is being pulled directly from the magnetic stripe and may not need to populate these fields.