Merchandise Locator App Development

Software tool for merchandisers I want an app that helps merchandisers find the items they merchandise. The app must accurately display the locations of each item no matter how small or big it is through either its article number or its barcode. I want the app to be able to link to multiple company databases but never without the proper authorisation from the company itself. It must only pick up items once scanned in by that companies stock controller and must work in sychronisation with the company system to track where the stock is at all times up until it is scanned by the tillpoint. Once checked out by the tillpoint, it must no longer display where the item is. In case the customer doesnt want the item anymore and its returned to the store, the item must be picked up again by the system. The app must be able to work seamlessly with the company system. Always keeping track of how much stock is available for that product and where it can be found. It should pinpoint the X,Y, Z coordinates for the product and display where the person is in relation to the item, whether higher elevation or lower and how far, in different units of measure. It must be able to have different detection radii for easier tracking as well as have a way to mark what has already been found.