On Kiosk
For kiosk receipt printing, the receipt file is here on the kiosk:
C:\PF Kiosk\PrintServer\apmconfig_receipt.xml
On Print 50
For invoice printing for web/kiosk/mobile orders, the invoice file is here on the Print 50 computer:
C:\Program Files (x86)\Photo Finale Print 50\Resources\en-US\Invoice\Invoice.htm
Print 50 is also capable of printing a kiosk-style receipt using the print server (there is an option to print a receipt when print server processes an order). That file is found here on the Print 50 computer: C:\Program Files (x86)\Photo Finale Print 50\Tools\PrintServer\apmconfig_receipt.xml