Shopify API app

I need you to develop some software for me. I would like this software to be developed for Windows . Budget up to 200€ - be realistic and as well We do not have time to go over the app features 100 times, you should know what you are doing and do it as fast as possible. Im using Shopify. I have received API’s from my supplier so I can automate the product Import and management. I need an app that will do following: 1. Collect all product details from my supplier. (stock, categories, description, photos, price, other options like size, colour etc) 2. keep history of changes in price and alert changes in price to email / keep history of changes in stock and alert in e-mail if stock is less then 50. 3. Checkbox to Select which products are to be updated or imported to the Shopify 4. allowing me to make Direct changes and updates in the app itself for all this details (stock, category, price etc.) 5. keeping “Current version” of item list already imported in Shopify saparate from the overall list of all items my supplier has. 6. allowing me to manually enter items that are not available at my supplier to the Shopify and edit them in the same app - so i can Import my own items to the list for easier use. 7. The overall list of all items my supplier has should be updated every 15 minutes. 8. Can work offline (obviously no updates then until network is back again)