zero dollar product

[William Perng]

When I try to create an order with only shipping charge (the product value
is 0 after promotion or we can change it to 0 in the cart) and pay by credit
card, the amount is not captured correctly.  It seems nothing will be
captured, if the product value is 0.  However, I do need the shipping charge
to be captured.  Can someone please help me ?
 
Thanks
 
William