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, it is a part of Store Manager (it is already built into the software). So in order to use Amazon Integration addon you first need to install and register Store Manager for Magento, PrestaShop, or WooCommerce.
After that you can register the addon with a separate license key and start using it.