M2EPro is a Magento module which allows the Magento backend to create and manage listings and orders on third party marketplaces including eBay, Amazon, and Rakuten.
M2E adds administrative functions for integration with the marketplaces. The extension allows for organizing groups of products (or single) into listings with shared settings that control the listing settings and content for each marketplace. Listings can be managed exclusively from within Magento.
The extension works in near-realtime; using a cron task to synchronize orders and product listings.