Connect our Magento Store to Amazon api

We are looking for someone to do a few things dependant on price. We currently have a txt file on our server which is updated hourly. This is manually uploaded to amazon once a day. 1. We want to make sure our inventory in magento runs in sync with amazon inventory (for example, if we sell an item in magento..... it needs to update amazon). This can be updated several times a day. We are only looking to sync the inventory field /column..... if its easier to do all fields/columns ....so be it! 2. We want to download orders from Amazon into "Orders/Sales" in Magento (this would be nice but not essential if too expensive) Interested to hear if you have any better idea? Look forward to hearing from you.