Is there any way for the display of a custom checkout field to be conditional on the product(s) in the cart?
In my case if the cart contains a software upgrade product I need a custom field for the customer to enter their current registration number for the software they are upgrading.
Ideally I'd be able to use logic such as - IF cart contains product SKU A OR product SKU B THEN include custom field 1.
Any way to accomplish this?