PayPal Payflow Pro backend for Business::OnlinePayment

 This is Business::OnlinePayment::PayflowPro, an Business::OnlinePayment
 backend module for PayPal Payflow Pro. It is only useful if you have a
 merchant account with PayPal Payflow Pro:
 https://www.paypal.com/cgi-bin/webscr?cmd=_payflow-pro-overview-outside
 .
 Business::OnlinePayment is a generic interface for processing payments through
 online credit card processors, online check acceptance houses, etc. (If you
 like buzzwords, call it an "multiplatform ecommerce-enabling middleware
 solution").