E-Commerce Configuration Guide : Site Configuration Settings : Debitware Settings : DWPayment
 
DWPayment
Key value:
0 or 1
Description:
Enables (1) or disables (0) In-House Cards item as a form of payment on the checkout.aspx page. Set DWPayment to 1 to enable a check box on the Checkout.aspx page that allows paying with an In-House Cards card.
See also:
InHouseCardTypeText