I use Magento and use Amazon Fulfillment to deliver my orders. I need an extension built to
a) pick up orders placed on my magento site and automatically deliver them to Amazon Fulfillment
b) Sync inventory from Amazon to Magento
There were several extensions that did this, but when Amazon switched it's API it seems many of them broke and no longer work. I have purchased one of the non-working ones so I can give you access to that as a thought starter.
You must have worked with the Amazon API before as well as Magento. Please give examples if you want responses.
Ideally, we would package this up as a Magento extension for easy install, updates.