Create a Privae Shopify Product App - API Feed Integration

Hello, I need to create a private app on Shopify to import products using API keys from supplier. Please look at the following to see if you can do all or one: Solution1: An embedded Shopify App with Node.js and heroku free hosting Solution2: It is possible to back off shopify if we can achieve the result using only JS and a HTML file. Just setup an application proxy to point to the CDN location of your asset folder and upload your JS and HTML. As this will keep the same domain as the shop Solution3: webhook with your theme [login to view URL] Please CONTACT me if you can do this THANK YOU!