[ic] Help implementing PayPal Pro

[Bill Jones]

Here's where I'm stuck: the module is Vend::Payment::PaypalPro, written 
by Erik Fantasia.  The page describing it  
(http://www.interchange.rtfm.info/icdocs/payments/PaypalPro.html) 
references settings called "user", "secret", "keyfile" and "sandbox", 
which all make sense from a PayPal perspective but I can't figure out 
where these settings should reside within Interchange (e.g. in which 
configuration file and what the variable names should be).  Any help 
would be greatly appreciated.