I would like to build an extension that uploads products from Magento to eBay, Amazon, Rakuten and similar. We can also use Open Cart if you think that's a better route to go.
If you are familiar with M2E - I want something similar.
Have you built an extension like this before?
Please explain the system flow - what technologies / services will you use to accomplish this?
What issues you foresee?
Looking forward to your proposals.