This callback method will return first and second pin

And please take note that the clear text of passwords are not able to be extracted from [EMPinAuthInput](../Protocols/EMPinAuthInput.html) objects in callback.

• 'firstPin' The first (default) pin that user entered. In the single-data mode, this is the only variable that would be returned.
• 'secondPin' In the double-data mode, this pin is returned along with the firstPin. Note that there is NO guarantee that the two pins entered are the same.