The most commonly used card readers are the ID Tech Minimagstripe readers, and the ID Tech Versakey keyboards with the magstripe reader built-in. Download the configuation utility from www.idtechproducts.com.
The Minimagstripe reader should be configured for track 2 only.
The Versakey reader works better when configured for ‘Any Track’. The USB 2-track version is part number IDKA-234112B.
No prefix is necessary for use with Creditline.