The customer puts insole in the cart, at checkout popup offers additional 20% coupon on products NOT ALREADY in the cart. customer goes and adds additional products coupon applies.
Is a coupon with this restriction possible?
I imagine that an auto-coupon would be best.
Please can you provide a how-to on achieving this?
This is not possible with our plugin. With customization this can probably be achieved somehow by marking the items already in cart and applying the coupon on the checkout page. The auto-coupon functionality won’t help.