iPayment - Chase Paymentech Multi-Currency Setup

We have been using iPayment for several years, processing only US dollars, with First Data North as our BEP.  We are switching to Chase Paymentech so our Canadian division can start to process credit cards in Canadian Dollars.  This will require a separate division number and payment system identifier, with routing rules based on currenncy, to be setup in iPayment.  We do not anticipate any problems there.

My question concerns the Receipt Class and Payment Method setup in AR.  Should we create two separate Receipt Classes, one for the US and one for Canada, or should we create one Receipt Class with two Payment Methods?  Or does it really matter?