Hide C.O.D if free shipping and zero weight..

Hi there, i want to ask if anyone knows how can i make the payment C.O.D to hide if the product has free shipping and 0.0 weight…

I need this coz i offer some services, so they cant be paid with cod because there is no shipping at all…

Thanks in advance

PS: I am on cs-cart v2.2.5

Do you need to check both conditions? How about mix orders of such product with other products? You can PM me to discuss more details.

yes both conditions are needed