I wanted to do a quick overview to see if this solution would be valid as sales channel on Shopify (and most likely pass their approval).
We're looking to integrate a marketplace (not us) into our Shopify store in order to cross-post our Shopify products on that marketplace. They do not have an API, so we're going to do this through alternate methods. One of Shopify's rules seems to be that we cannot install standalone software, so we're thinking we can wrap our solution into its own API and connect our sales channel/app with this. If this would be an acceptable solution, and we also plan to leave this unlisted, would it be acceptable to make this very custom for us only? Or would we need to design this API and app to be used by anyone through Shopify (not just us)?
Does this solution seem possible and appropriate for a sales channel or as an app? Which sales channel method would be most appropriate for this (Orders API?)?