M2E Pro fully integrates Magento backend with eBay, Amazon and Walmart marketplaces. Merchants retain full ownership over their own data and nothing is stored off-site. The value of M2E Pro technology comes from the high level of customization and task automation. The ability to manage orders, maintain various pricing strategies and keep inventory across multiple channels in full sync are some of the benefits which M2E Pro delivers out of the box.
The Repricing Service can either be used in combination with the M2E Pro Extension via Repricing Tool or as a separate SaaS Service. It's flexible and easy settings allow users to provide settings for the dynamic Price management of their Products in a fast and convenient way without any special skills required.
Please, take a time to review the documentation for a better understanding of the working logic of the tool you would like to use.