to have this feature, do I need a professional or standard version?

we are building a new store.  I need the customer to order at least 15 items to be able to check out.  15 items can be the same product or a mix of different products.   do you have a solution?

we are building a new store.  I need the customer to order at least 15 items to be able to check out.  15 items can be the same product or a mix of different products.   do you have a solution?

we have an online store. we need the customer to buy at least 15 items, 15 items can be the same or a mix of different products.   If you have a solution, please contact me.