A magnetic card reader or swiper can be used to read credit cards, debit cards and customer membership cards.
Most magnetic card readers behave like keyboards and will recognize the encoded information once you scan the card. They don't normally require the installation of additional software for them to work. Imonggo, however, will only support magnetic card readers that behave like keyboards (or operate in keyboard emulation mode).
To test if your magnetic card reader is working properly, you can open Notepad (in Windows) or TextEdit (in Mac) and try to swipe a magnetic card. If you are able to see a string of text, then your magnetic card reader is working properly.
If you are using certain Magtek card readers that are shipped in HID mode, you need to download software from Magtek to reprogram it to Keyboard Emulation mode for it to work in Imonggo.