Like a check, COD payments are received some time after the order is created. If you enable this module the string "COD" appears in the Pay With drop-down list in the Shipping/Payment Selection (OSEL) screen. When a customer selects COD as the payment method the order status is set to authorized, but you have to manually capture funds by editing the order and clicking on the Capture button.
Charge: The COD charge that you want added to the order. The value you enter here will show up as a line item in the Payment Information (OPAY) screen.
Message: The text that you enter in this field appears in the Payment Information screen. You can use this field to give the customer any special instructions for COD orders.