Create a basic product listing management link via website apis

You will create a simple application using amazon, google spreadsheet, and either one of these 4 (square, shopify, storenvy, or ebay) apis to create a link in inventory quantities and attributes using api. Must be able to simulate a virtual order to one of the 4 when inventory is decreased in spreadsheet or amazon. In addition when an increase is made to one of the 4 it should increase in spreadsheet and amazon. New products are added and removed all the time, sometimes without being restocked so its important that there's easy way to link the spreadsheet entry and the listings using some sort of matching attribute. Price column should also be linked. Further explanation provided upon preliminary interview