Amazon Integration Documentation
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Amazon Integration is a Store Manager addon that allows exporting products from your online store to Amazon, synchronize inventory, and import orders placed on Amazon.
Amazon Integration is a Store Manager addon that is a part of Store Manager (it is already built into the software) and should be registered with a separate license key. So in order to use the addon you have to install and register Store Manager for Magento, PrestaShop, VirtueMart, OpenCart and WooCommerce.