BETA VERSION. Business::OnlinePayment::Cardstream is a sub class to Business::OnlinePayment, a generic online payment module, to enable integration with Cardstream. INSTALLATION (Quick). perl makefile.PL make make install See the pod documentation of Cardstream.pm and Business::OnlinePayment for useage instructions. For information on obtaining a merchant account please visit http://www.cardstream.com or e-mail sales@cardstream.com.