Hide payment option for certain categories of products

who has an idea for this?

I need to have active pay only for certain categories

I am creating a site type (groupon)

The coupons must not have any type of payment (and assigned an expedition “free”)

Instead, some products in certain categories, they need payment system and have activated the shipping …

if any of you have an idea, thank you in advance

i made with multivendor 3.02

THX - Rinaldo