eBay importer built on subdomain for our marketplace

Description of the mod:

 This mod should allow our sellers to import their ebay items by simply entering their ebay username. The mod will then parse all of the seller's items, using also certain prefilled fields. The mod will parse the eBay items using the official eBay API.

 Requirements:
 - Create a eBay importer that will be hosted on a subdomain
 - When importing eBay listings, the eBay categories has to match with our categories. 
- People can register/login
- People can manage their imported listings on the subdomain
 - After importing eBay listings, users can export the listings to CSV (the file structure has to match our csv structure)


 - Categories mapping - Shipping mapping Backend Settings for eBay API: 

- Field to enter eBay App ID 
- Field to enter eBay Dev ID 
- Field to enter eBay Cert ID
 - Field to enter eBay App RuName