I want to just create a placeholder for a course I'm selling on Udemy. I want people to see on Shopify that I sell that service but I don't want to host that course on Shopify. I want people to get redirected to my course website to buy it over there. It is OK if this particular product has no price on Shopify.
The listing on Shopify is just for people to know that apart from my physical products, I also have a course on Udemy.