MSI Add-on is an add-on of Improved Import & Export extension, and only works with the Improved Import extension installed. You can download MSI Add-on from your Firebear Studio account for FREE when Improved Import & Export is purchased.
Magento 2 eBay integration add-on allows you to upload products to eBay marketplace from your Magento 2 store using Improved Import and Export extension for Magento 2.
The add-on uses eBay API to establish connection between eBay marketplace and your Magento 2 store. To start working with the add-on you will need to have eBay developer account created. More information on how to do it you will find in the manual below.