I am a Shopify expert and spend my days writing links using the Shopify API. I can take your suppliers datafeed or scrape their website to enter products into Shopify I can monitor suppliers stock levels and update your store I can process orders with your supplier when someone orders from your site I can add orders to your back office systems I can create packing and shipping systems I can setup bespoke programming to manage your store. Let me know what you need and there is a good chance I can make it happen even if others have told you they cannot integrate with your systems.