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We are an online bookshop and require an application to use Amazon's API to search by ISBN/EAN of a book and use the price advertised, and the sales rank to display a "sell" or "not sell" result.
The application will work as follows;
1 - User scans the barcode of a book
2 - Application searches Amazon using their API
3 - Application displays a result "Tick" or a "Cross" for whether the item is sellable or not, by checking search results for the book against the user defined parameters.
i.e. Application will display a "tick" if sales rank is £1
Application will display a "cross" is sales rank is >200 and