We downloaded the free trial they offer, but it is encoded and all online Payment processors are not available in the free trial.
This seems simple enough to me to solve. We know that the CS team encrypted the trial version, for their own safety. Fair enough.
However, you own a copy of the code now, just zip up the payment module and send it to the payment developers. They will not have the code for the whole card, just the payment modules. So, you should not be breaking the license agreement.
EagleRose