Private App for Shopify

Hello, I need to create a custom private app on Shopify to import products using API keys from suppliers. If you can create REST/SOAP API features on shopify please contact me. The app will have one textbox that can be used to input the API url and upload button. API url will be the variable. I have thousands of API keys from suppliers that i need to use, so i need an app that can manipulate any API format 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 - be able to sync with the suppliers website/api - so when they delete or add new products its sync with my website. Please CONTACT me if you can do this THANK YOU!