Worth checking how well any option handles scoped access too, since partner integrations down the line usually need their own API permissions rather than one shared login for everything. Stock and pricing sync is another spot where generic setups tend to fall apart once discounts vary by customer, so that logic needs to sit close to the catalog itself. You can check out open source ecommerce here https://medusajs.com/ . It handles cart, checkout, and inventory already, and the same catalog it manages can get pulled straight into a mobile app or handed to partners through its API later on.

Guesswork only gets you so far when there's a way to actually see what an AI agent picks up from your page instead of assuming it works the same as a search crawler. You could check whether your product is AI ready and see how it works on a real example here: https://isitagentready.com/upvote.club . It gives you a sense of where your page might be falling short for AI tools, whether that's specs, reviews, or something else not coming through clearly. That way you're working off something concrete instead of guessing where the disconnect is.