Buyers are more comfortable shopping from sellers who accept returns. When listing a new Item via M2E Pro, you can submit your Return Policy details to eBay site.
Return Policy options vary depending on the eBay site. You may need to provide several additional details for the Return Policy on eBay GE, AT, FR, IT, ES.
In M2E Pro, you can set up return options for both International and Domestic sales. For example, you may offer a free domestic return, whereas your international buyers will need to pay for returns they make.
Find more details on processing eBay returns in this article.