I would try sticking "Credit Card Processing Software Reviews" or similar into Google.
Airshow
Airshow
WiFi Lounge Lizard
2,683 posts since Apr 2009
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Quibbie,
In that case, you would appear already to have two systems/applications that can receive swipecard data.
I think your best bet would be to seek/write an extension to one or other system/application such that one receives the data and passes it to the other. That would involve one interface.
If you were to find/write a third system/ application to receive swipedata and pass it on to both existing systems/applications, then it would involve two interfaces.
In general two interfaces will be more difficult/expensive than one to develop/integrate. Therefore I think your first choice should be to extend one or other of your existing systems rather than look for a third element.
What ever approach you eventually adopt, the process will start with an internet search.
Airshow
(Many years experience as a Systems Engineer)
Airshow
WiFi Lounge Lizard
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