There is an Amazon App provided by shopify but it doesn't do everything we want. We need an app that can link our products to the Amazon products using the SKU number.
2 Options for this project. It's up to you to know what will work.
Option 1. We can use the Shopify Amazon app and the only thing our app needs to do is link our products to the matching Amazon listing with the SKU.
Option 2. If it is not possible to write an app that integrates with another app. I do not know if this is the case. In this case we would have to duplicate the functionality of the Shopify Amazon app but include the auto linking via SKU.