Within FoxyCart it is possible to add multiple card payment processors using the Payment Sets option. For example we have BlueSnap and PayPal Payments Pro.
Sometimes when a customer transaction is declined by one processor it can be due to a technical issue. We then (utilising Payment/template sets) send the customer and alternative link to make payment using a different card gateway configured under a different payment set.
I think it would be good if we could configure FoxyCart to process cards under multiple payment providers. So configure a primary and secondary processor. If the primary fails try the secondary automatically.
This can reduce customer friction and improve conversions.