Private Shopify App - API integration

Hello, I need to create a custom private app on Shopify to import products using API keys from supplier. If you can create REST/SOAP API features on shopify please contact me. 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] The app should also be able to sync with the suppliers website/api - so when they delete or add new products its sync with my website. I have thousands of API keys from suppliers that i need to use, so i need an app to input the API keys to import products. The app should do the following: - Products integrated into your own Shopify store. - Inventory updates sent automatically to your store - Fulfill Shopify orders with a single-click - Generate custom pricing markups - Edit Product title, description, price and images automatically added for every item. - Easily add and sync items with a single-click Please CONTACT me if you can do this THANK YOU!