Create a webapp to retrieve manipulate and auto update information using API eBay and Amazon.

First we are not drop shippers. We buy items on eBay (we have multiple eBay accounts) repair or restore them or buy new. Then after we receive the product form eBay we inspect the item, do what we need with it, or return the item to seller if damaged or not as described. After that we send this item to Amazon FBA to sell (We currently have one amazon account but might have more later).
We need to automate this prosses. We need to create an application that would be installed/available online and used throw the internet anywhere. This need to be secure application with different privileges users like admin editor and viewer. It would have a dashboard to show current summery status of eBay item and Amazon. Then it should have Ebay tab to pull and manage data by API as described below. Next tab should be for combining and manipulating data in order to get it ready to be imported into Amazon. Third tab should be for Amazon to manage data by use Amazon API also described below. We will also need financial reports of profit and loss. We are not yet finalize anything so any input or changes would be welcomed, to make thing easier.

Create a webapp to retrieve manipulate and auto update information from eBay and Amazon.