script to convert Amazon sellercentral flat file to ebay file manage listing template

Looking for a contractor to develop a script or Api to convert Amazon seller central flat file to ebay file manage listing template. Ideally I am looking to list goods in different marketplaces such as google shop, ebay, play, rakuten, yahoo store. I require automation script that can enable to quickly convert file and import the data to the template that a marketplace. Any guru with experience please post me some samples. This application is most likely going to be needed on our website admin where all the process can be done.